436590
domain: N
Appears in sequences
- Triangle arising from solution to a*x = tan x (next row contains non-integral entries).at n=20A059368
- Number of cycles with entries of the same parity in all fixed-point-free involutions of {1,2,...,2n}.at n=7A161122
- A Galton triangle: T(n,k) = 2*k*T(n-1,k) + (2*k-1)*T(n-1,k-1).at n=26A187075
- Triangle T(n,k), 0<=k<=n, given by (0,2,0,4,0,6,0,8,0,10,0,...) DELTA (1, 2, 3, 4, 5, 6, 7, 8, 9,...) where DELTA is the operator defined in A084938.at n=34A211402
- Numbers k such that 2*k+1 and 3*k+1 are both triangular numbers.at n=2A274603
- a(1) = 1. For n > 1, a(n) = a(n-1)/2 if a(n-1) is even, a(n) = a(n-1)*n otherwise.at n=25A290650
- Matrix product of triangle of Stirling numbers of second kind A008277 and square of unsigned Lah triangle A105278.at n=41A308440
- Numbers k such that k^(k + 1) == k + 1 (mod 2*k + 1) while 2*k+1 is not prime.at n=19A380831