20152910577domain: NAppears in sequencesRow sums of Riordan array (c(-x^2),xc(-x^2)^2)^(-1) where c(x) is the g.f. of A000108.at n=28A138164a(n) = Sum_{k=0..n} (4*k+1) * binomial(3*n+k+1,n-k)/(3*n+k+1).at n=14A390519