254016

Appears in sequences

• Order of universal Chevalley group D_n (8).at n=1A003835
• Order of universal Chevalley group D_2(q), q = prime power.at n=5A003841
• Order of (usually) simple Chevalley group D_2(q), q = prime power.at n=5A003848
• Number of primitive polynomials of degree n over GF(8).at n=7A027744
• Sigma(n) / d(n) is a perfect square associated with A049226.at n=35A049227
• Expansion of e.g.f.: (log(1-x))^2*x^2.at n=9A052754
• Triangle T(s,t), s >= 1, 1 <= t <= s (see formula line).at n=51A059836
• Squares such that the sum of two neighboring term is also a square.at n=15A072471
• Squares which are the product of a non-palindrome and its reversal, where leading zeros are not allowed.at n=2A076750
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-2,0,2}.at n=22A079986
• a(n) = T(n)^2, where T(n) = A000073(n) is the n-th tribonacci number.at n=13A085697
• Expansion of (1+4x)/AGM(1+4x,1-4x) where AGM denotes the arithmetic-geometric mean.at n=11A092266
• Number of tilings of an n X n section of the square lattice with "ribbon tiles". A ribbon tile is a polyomino which has at most one square on each diagonal running from northwest to southeast.at n=4A095968
• a(n) = n^2 * (n+1)^2 * (n+2)^2 = 36*A001249(n-1).at n=7A099764
• a(n) = 2^(n-1)*binomial(2*n-1,n-1)^2.at n=5A116421
• Delannoy paths counted by number of weak peaks.at n=49A133214
• a(n) = period of the sequence {b(m), m>=0}, defined by b(m):=binomial(m+n,n) mod n.at n=41A133900
• Perfect squares in A133459; or perfect squares that are the sums of two nonzero pentagonal pyramidal numbers.at n=25A136359
• a(1)=1; at n>=2, a(n) = least square > a(n-1) such that sum a(1)+...+a(n) is a prime number.at n=23A139033
• Triangle read by rows: T(n,k) = number of forests on n labeled nodes, where k is the maximum of the number of edges per tree (n>=1, 0<=k<=n-1).at n=39A143911