Cumulative sum of quintuple factorial numbers n!!!!! (A085157).

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =11a(5) =16a(6) =22a(7) =36a(8) =60a(9) =96a(10) =146a(11) =212a(12) =380a(13) =692a(14) =1196a(15) =1946a(16) =3002a(17) =5858a(18) =11474a(19) =21050a(20) =36050a(21) =58226a(22) =121058a(23) =250226a(24) =480050a(25) =855050a(26) =1431626a(27) =3128090a(28) =6744794a(29) =13409690