Partial sums of A014166.

Terms

a(0) =1a(1) =6a(2) =22a(3) =63a(4) =155a(5) =344a(6) =709a(7) =1383a(8) =2587a(9) =4685a(10) =8273a(11) =14323a(12) =24416a(13) =41119a(14) =68595a(15) =113590a(16) =187030a(17) =306605a(18) =500950a(19) =816410a(20) =1327986a(21) =2157046a(22) =3499982a(23) =5674578a(24) =9195035a(25) =14893364a(26) =24115804a(27) =39040633a(28) =63192397a(29) =102273950