27020

Appears in sequences

• Number of ways to place 4 nonattacking queens on a 4 X n board.at n=17A061990
• Numbers n such that Maple 9.5, Maple 10, Maple 11 and Maple 12 give the wrong answers for the number of partitions of n.at n=43A110375
• a(n) = 1000*n + 20.at n=26A157510
• G.f.: sqrt( 1 + Sum_{n>=1} 4*x^(n^2) ).at n=11A223027
• Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of Product_{j>=1} 1/(1 - j*x^j)^(j^k).at n=59A294589
• Triangular array read by rows. T(n,k) is the number of n X n matrices over GF(2) such that the sum of the dimensions of their eigenspaces taken over all eigenvalues is k, 0 <= k <= n, n >= 0.at n=12A346201
• Triangular array read by rows: T(n,k) is the number of partial order relations on [n] that have exactly k components, n>=0, 0<=k<=n.at n=41A352399
• Triangle read by rows: T(n,k) is the number of partitions of a 4-colored set of n objects into exactly k parts with 0 <= k <= n.at n=50A382341