This sequence and A139143 are complements. a(1) = 1, A139143(1) = 2, a(n+1) = a(n) + Sum_{k = 1..n} A139143(k).
A139142
This sequence and A139143 are complements. a(1) = 1, A139143(1) = 2, a(n+1) = a(n) + Sum_{k = 1..n} A139143(k).
Terms
- a(0) =1a(1) =3a(2) =9a(3) =20a(4) =37a(5) =61a(6) =93a(7) =135a(8) =188a(9) =253a(10) =331a(11) =423a(12) =530a(13) =653a(14) =793a(15) =951a(16) =1128a(17) =1326a(18) =1546a(19) =1789a(20) =2056a(21) =2348a(22) =2666a(23) =3011a(24) =3384a(25) =3786a(26) =4218a(27) =4681a(28) =5176a(29) =5704
External references
- oeis: A139142