a(n) = binomial coefficient C(n,46).

Terms

a(0) =1a(1) =47a(2) =1128a(3) =18424a(4) =230300a(5) =2349060a(6) =20358520a(7) =154143080a(8) =1040465790a(9) =6358402050a(10) =35607051480a(11) =184509266760a(12) =891794789340