236436

Appears in sequences

• a(n) = binomial(2*n-1, n) - binomial(2*n-1, n+3).at n=10A026016
• a(n) = T(n, [n/2]), where T is the array defined in A026009.at n=21A026021
• Expansion of (1+x^2*C^4)*C, where C = (1 - sqrt(1-4*x))/(2*x) is g.f. for Catalan numbers, A000108.at n=11A071725
• a(n) = n*(n+1)*(n+2)*(n+3)*(1+3*n+n^2)/120.at n=15A101094
• Triangle read by rows, based on a simple Jacobsthal number recursion rule.at n=51A114163