a(n) = 1 + 2*3 + 4*5*6 + 7*8*9*10 + ... + ...*n (see Example lines).

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =11a(5) =27a(6) =127a(7) =134a(8) =183a(9) =631a(10) =5167a(11) =5178a(12) =5299a(13) =6883a(14) =29191a(15) =365527a(16) =365543a(17) =365799a(18) =370423a(19) =458551a(20) =2226007a(21) =39435607a(22) =39435629a(23) =39436113a(24) =39447751a(25) =39739207a(26) =47329207a(27) =252562807a(28) =6006997207a(29) =6006997236