a(n) = hypergeom([ -n, (n+4)/2, (n+5)/2], [3, 2], -4).

A087659

a(n) = hypergeom([ -n, (n+4)/2, (n+5)/2], [3, 2], -4).

Terms

    a(0) =1a(1) =6a(2) =57a(3) =701a(4) =10147a(5) =164317a(6) =2888282a(7) =54047434a(8) =1062530119a(9) =21739192762a(10) =459685114665

External references