a(n) = 4^n*hypergeom([-n/4, (1-n)/4, (2-n)/4, (3-n)/4], [1, 1, 1], -1).
A294037
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) =232a(5) =544a(6) =-1664a(7) =-37376a(8) =-362024a(9) =-2743712a(10) =-17780864a(11) =-98955776a(12) =-442825664a(13) =-1129423616a(14) =5536033792a(15) =118591811584
External references
- oeis: A294037