A transform of binomial(n,5).

Terms

a(0) =1a(1) =6a(2) =42a(3) =224a(4) =1008a(5) =4032a(6) =14784a(7) =50688a(8) =164736a(9) =512512a(10) =1537536a(11) =4472832a(12) =12673024a(13) =35094528a(14) =95256576a(15) =254017536a(16) =666796032a(17) =1725825024a(18) =4410441728a(19) =11142168576a(20) =27855421440a(21) =68975329280a(22) =169303080960a(23) =412216197120