G.f.: A(x) = Sum_{n>=0} binomial(3*(n+1), n)/(n+1) * x^n / (1+x)^(2*(n+1)).
A316371
G.f.: A(x) = Sum_{n>=0} binomial(3*(n+1), n)/(n+1) * x^n / (1+x)^(2*(n+1)).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =105a(6) =382a(7) =1429a(8) =5463a(9) =21248a(10) =83813a(11) =334485a(12) =1348102a(13) =5479366a(14) =22433934a(15) =92437445a(16) =383026643a(17) =1595053047a(18) =6672007021a(19) =28020635404a(20) =118106170713a(21) =499454897337
External references
- oeis: A316371