a(n) = 1*2*3*4*5*6*7*8*9*10 + 11*12*13*14*15*16*17*18*19*20 + 21*22*23*24*25*26*27*28*29*30 + ... + (up to n).
A319212
a(n) = 1*2*3*4*5*6*7*8*9*10 + 11*12*13*14*15*16*17*18*19*20 + 21*22*23*24*25*26*27*28*29*30 + ... + (up to n).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =5040a(7) =40320a(8) =362880a(9) =3628800a(10) =3628811a(11) =3628932a(12) =3630516a(13) =3652824a(14) =3989160a(15) =9394560a(16) =101646720a(17) =1767951360a(18) =33525757440a(19) =670446201600a(20) =670446201621a(21) =670446202062a(22) =670446212226a(23) =670446456624a(24) =670452577200a(25) =670611967200a(26) =674921872800
External references
- oeis: A319212