104425domain: NAppears in sequencesa(n) = Sum_{k=0..n} binomial(n,k) * binomial(6*k,k) / (5*k + 1).at n=6A346648Coefficient of x^n in the expansion of ( 1/(1-x) * (1+x^3)^2 )^n.at n=9A370248Antidiagonal sums of A343053.at n=32A377521a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n*k,k) / ((n-1)*k + 1).at n=6A378327