a(n) = binomial(2*n + 1, n)*hypergeom([-(n + 1)/2, -n/2], [n + 2], 4).

A344396

a(n) = binomial(2*n + 1, n)*hypergeom([-(n + 1)/2, -n/2], [n + 2], 4).

Terms

    a(0) =1a(1) =5a(2) =25a(3) =133a(4) =726a(5) =4037a(6) =22737a(7) =129285a(8) =740554a(9) =4266830a(10) =24701425a(11) =143567173a(12) =837212650a(13) =4896136845a(14) =28703894775a(15) =168640510725a(16) =992671051482

External references