110637
domain: N
Appears in sequences
- Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly one way.at n=17A076454
- Triangle R, read by rows, such that R^3 transforms column k of R^3 into column k+1 of R^3, so that column k of R^3 equals column 0 of R^(3*k+3), where R^3 denotes the matrix cube of R.at n=23A113389
- Column 2 of triangle A113389, also equals column 0 of A113370^9.at n=4A113391
- Triangle, read by rows, given by the product R^-2*Q^3 = Q^-1*P^2 using triangular matrices P=A113370, Q=A113381, R=A113389.at n=31A114151
- Number of reduced words of length n in Coxeter group on 19 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.at n=4A163110
- Number of Dyck paths of semilength n, having no ascents and no descents of length 1, and having no UUDD's starting at level 0.at n=18A166300
- Number of 4 X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.at n=25A229447
- Expansion of (1+4*x+x^2)/((1+x)^2*(1-x)^5).at n=34A233329