Partial sums of A002234.

Terms

a(0) =2a(1) =5a(2) =11a(3) =41a(4) =116a(5) =197a(6) =312a(7) =435a(8) =684a(9) =1046a(10) =1430a(11) =1892a(12) =2404a(13) =3155a(14) =3977a(15) =9289a(16) =17044a(17) =26575a(18) =38954a(19) =54776a(20) =73661a(21) =96632a(22) =119637a(23) =218363a(24) =361381a(25) =512404a(26) =1179475a(27) =2374678a(28) =3643657a(29) =5111420