Partial sums of A050508.

Terms

a(0) =0a(1) =2a(2) =8a(3) =23a(4) =47a(5) =87a(6) =147a(7) =224a(8) =328a(9) =463a(10) =623a(11) =821a(12) =1049a(13) =1322a(14) =1644a(15) =2004a(16) =2420a(17) =2896a(18) =3418a(19) =4007a(20) =4647a(21) =5361a(22) =6153a(23) =7004a(24) =7940a(25) =8940a(26) =10032a(27) =11220a(28) =12480a(29) =13843