Partial sums of A185381.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =14a(5) =35a(6) =69a(7) =158a(8) =302a(9) =679a(10) =1666a(11) =3263a(12) =7444a(13) =18390a(14) =36101a(15) =82469a(16) =157494a(17) =353912a(18) =868141a(19) =1700181a(20) =3878490a(21) =7403068a(22) =16630533a(23) =40788350a(24) =79876519a(25) =182210674a(26) =450124970a(27) =883619407a(28) =2018522577a(29) =3854834480