a(n) = 2^(2*n - 5)*binomial(n-5/2, -1/2)*(36*n^4 - 78*n^3 + 54*n^2 - 48*n + 24)/((n + 1)*n*(n - 1)) for n >= 2 and otherwise 1.
A344321
a(n) = 2^(2*n - 5)*binomial(n-5/2, -1/2)*(36*n^4 - 78*n^3 + 54*n^2 - 48*n + 24)/((n + 1)*n*(n - 1)) for n >= 2 and otherwise 1.
Terms
- a(0) =1a(1) =1a(2) =8a(3) =49a(4) =246a(5) =1157a(6) =5248a(7) =23256a(8) =101398a(9) =436865a(10) =1865136a(11) =7906054a(12) =33319388a(13) =139754994a(14) =583859968a(15) =2430991670a(16) =10092510630a(17) =41794856985a(18) =172699266480a(19) =712220712390
External references
- oeis: A344321