19080

Appears in sequences

• Rook polynomials.at n=9A005777
• High-temperature coefficients for internal energy for spin-1/2 Ising model on b.c.c. lattice.at n=3A047711
• a(n) = 3*n*(4*n-1).at n=40A062783
• First differences of A069475, successive differences of (n+1)^6-n^6.at n=24A069476
• Number of essentially different ways in which the squares 1,4,9,...,n^2 can be arranged in a sequence such that all pairs of adjacent squares sum to a prime number. Rotations and reversals are counted only once.at n=16A073451
• a(n) = n*(n+13)*(n+14)/6.at n=40A111144
• Integer squares y from the smallest solutions of y^2 = x*(a^N - x)*(b^N + x) (elliptic line, Weierstrass equation) with a and b legs in primitive Pythagorean triangles and N = 2. Sequence ordered in increasing values of leg a.at n=24A120210
• a(0)=360, a(n)=a(n-1)+720 for n>=1.at n=26A140801
• Averages of twin primes of the form : i^2+j^2, as sum of two squares.at n=33A143793
• 5 times octagonal numbers: a(n) = 5*n*(3*n-2).at n=36A153795
• Numbers such that each digit from 0 to 9 appears at least 7 times in the digits of their divisors.at n=22A175507
• Integer areas of integer-sided triangles where two sides are of square length.at n=15A232461
• Number of length n+4 0..6 arrays with no disjoint pairs in any consecutive five terms having the same sum.at n=1A247402
• T(n,k)=Number of length n+4 0..k arrays with no disjoint pairs in any consecutive five terms having the same sum.at n=22A247404
• Number of length 2+4 0..n arrays with no disjoint pairs in any consecutive five terms having the same sum.at n=5A247406
• Numbers k such that k is the average of four consecutive primes k-7, k-1, k+1 and k+7.at n=22A258879
• Triangle read by rows: coefficients of rook polynomials.at n=64A259985
• Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any vertical neighbor equal to n-1.at n=4A265860
• T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with no element plus any vertical neighbor equal to n-1.at n=19A265863
• Number of 5Xn arrays containing n copies of 0..5-1 with no element plus any vertical neighbor equal to 5-1.at n=1A265866