a(n) = 4^n*hypergeom([-n/4, (1-n)/4, (2-n)/4, (3-n)/4], [1, 1, 1], 1).
A294036
a(n) = 4^n*hypergeom([-n/4, (1-n)/4, (2-n)/4, (3-n)/4], [1, 1, 1], 1).
Terms
- a(0) =1a(1) =4a(2) =16a(3) =64a(4) =280a(5) =1504a(6) =9856a(7) =70144a(8) =498136a(9) =3449440a(10) =23506816a(11) =160566784a(12) =1115048896a(13) =7905796864a(14) =56994288640a(15) =414928113664
External references
- oeis: A294036