190876696

Appears in sequences

• Number of ways of choosing at most n-1 items from a set of size 2*n+1.at n=14A008549
• a(n) = 2^(n-1) - binomial(n, floor(n/2)).at n=28A093387
• Number of walks f length n on a square lattice ending with x > 0 and y > 0.at n=15A186648
• a(n) = Sum_{k=0..13} binomial(n, k).at n=29A219676
• a(n) = 2^(n-1) + ((1+(-1)^n)/4)*binomial(n, n/2) - binomial(n, floor(n/2)).at n=29A294175