a(n) = Sum_{k=0..n} binomial(n+3,k+3) * binomial(2*k+6,k+6).
A387239
a(n) = Sum_{k=0..n} binomial(n+3,k+3) * binomial(2*k+6,k+6).
Terms
- a(0) =1a(1) =12a(2) =95a(3) =630a(4) =3801a(5) =21672a(6) =119154a(7) =639180a(8) =3369795a(9) =17543196a(10) =90476100a(11) =463291920a(12) =2359240975a(13) =11961944400a(14) =60440659640a(15) =304543085040
External references
- oeis: A387239