a(n) = Sum_{k=0..n} binomial(n+4*k,n-k) * Catalan(k).
A360103
a(n) = Sum_{k=0..n} binomial(n+4*k,n-k) * Catalan(k).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =49a(4) =283a(5) =1715a(6) =10793a(7) =69906a(8) =463031a(9) =3122264a(10) =21363065a(11) =147951489a(12) =1035173405a(13) =7306326465a(14) =51959150713a(15) =371950057003
External references
- oeis: A360103