Stirling numbers of first kind, s(n+3, n), negated.

Terms

a(0) =6a(1) =50a(2) =225a(3) =735a(4) =1960a(5) =4536a(6) =9450a(7) =18150a(8) =32670a(9) =55770a(10) =91091a(11) =143325a(12) =218400a(13) =323680a(14) =468180a(15) =662796a(16) =920550a(17) =1256850a(18) =1689765a(19) =2240315a(20) =2932776a(21) =3795000a(22) =4858750a(23) =6160050a(24) =7739550a(25) =9642906a(26) =11921175a(27) =14631225a(28) =17836160a(29) =21605760