Sums of nonconsecutive factorial numbers.

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =7a(5) =24a(6) =25a(7) =26a(8) =120a(9) =121a(10) =122a(11) =126a(12) =127a(13) =720a(14) =721a(15) =722a(16) =726a(17) =727a(18) =744a(19) =745a(20) =746a(21) =5040a(22) =5041a(23) =5042a(24) =5046a(25) =5047a(26) =5064a(27) =5065a(28) =5066a(29) =5160