854700

Appears in sequences

• Number of ways to place two nonattacking queens on an n X n board.at n=36A036464
• Triangle T(n,k) of number of minimal 4-covers of a labeled n-set that cover k points of that set uniquely (k=4,..,n).at n=26A057965
• Triangle read by rows: S_B(n,k) = "Type B" Stirling numbers of the second kind.at n=42A085483
• Number of permutations p() of 1..n+3 with centered difference p(i+1)-p(i-1) < 0 exactly twice.at n=7A180880
• Number of permutations p() of 1..n+8 with centered difference p(i+1)-p(i-1) < 0 exactly 7 times.at n=2A180885
• Triangle read by rows. T(n, k) = Bell(k)*Sum_{j=0..k}(-1)^(k+j)*binomial(n, n-k+j)*Stirling2(n-k+j, j) for n >= 0 and 0 <= k <= floor(n/2).at n=40A352607