a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026374.
A026949
a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026374.
Terms
- a(0) =1a(1) =12a(2) =83a(3) =630a(4) =3171a(5) =21672a(6) =97482a(7) =639180a(8) =2730615a(9) =17543196a(10) =72932904a(11) =463291920a(12) =1895949055a(13) =11961944400a(14) =48478715240a(15) =304543085040
External references
- oeis: A026949