Partial sums of A048694.

Terms

a(0) =1a(1) =8a(2) =23a(3) =60a(4) =149a(5) =364a(6) =883a(7) =2136a(8) =5161a(9) =12464a(10) =30095a(11) =72660a(12) =175421a(13) =423508a(14) =1022443a(15) =2468400a(16) =5959249a(17) =14386904a(18) =34733063a(19) =83853036a(20) =202439141a(21) =488731324a(22) =1179901795a(23) =2848534920a(24) =6876971641a(25) =16602478208a(26) =40081928063