82800

Appears in sequences

• Total height of rooted trees with n labeled nodes.at n=5A001864
• a(n) = n^2*(n^2 - 1)/4.at n=24A006011
• Coefficients of the polynomials in the numerator of the generating function f(x)=(x-x^2)/(x^3-2x^2-2x+1) for F(n)^2, (where F(n) is the Fibonacci sequence) and its successive derivatives starting with the constant.at n=43A079045
• Coefficients of the polynomials in the numerator of the generating function f(x)=(x-x^2)/(x^3-2x^2-2x+1) for F(n)^2, (where F(n) is the Fibonacci sequence) and its successive derivatives starting with the highest power of x.at n=39A079046
• Numbers k such that 2k-1 divides 2^k-1.at n=35A081856
• Generalized Stirling2 array (5,2).at n=21A091534
• Numbers containing squares of Pythagorean triples in their divisor set.at n=22A096472
• Numbers k such that the k-th prime is in A057468.at n=26A102808
• Numbers in A075728 which are not one less than some prime.at n=38A179232
• Numbers with prime factorization pq^2r^2s^4.at n=10A190319
• Number of closed paths of length n whose steps are 18th roots of unity, U_18(n).at n=6A198802
• First number beginning the smallest chain of n consecutive even divisors distanced no more than 2 one from each other, with no odd divisors between, of some factorial s!.at n=10A218707
• Numbers n such that 2n-1 and 2n+1 divide 2^n-1.at n=13A233089
• Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=5A237325
• Number of (n+1)X(6+1) 0..2 arrays with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=0A237330
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=15A237332
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=20A237332
• Square array read by antidiagonals: T(n,k) is the number of k-edge colored trees on vertex set [n] (n>=2, k>=2).at n=31A248090
• Number of sets of exactly n positive integers <= n+7 having a square element sum.at n=25A281970
• a(n) = 4*3*2*1 - 8*7*6*5 + 12*11*10*9 - 16*15*14*13 + ... - (up to the n-th term).at n=20A319887