389312

Appears in sequences

• Triangle read by rows: coefficients of a Bessel polynomial recursion: P(x, n) = 2*(n-1)*P(x, n - 1)/x - n*P(x, n - 2) with substitution x -> 1/y.at n=40A136668
• Number of ways to place 9 nonattacking bishops on an n X n board.at n=6A187241
• Total number of ways to place k nonattacking bishops on an n X n chess board. Triangle T(n,k) read by rows (0 <= k <= 2*n-[n>0]-[n>1]).at n=47A378590