Partial sums of A000337(n+4), n >= 0.

Terms

a(0) =1a(1) =6a(2) =23a(3) =72a(4) =201a(5) =522a(6) =1291a(7) =3084a(8) =7181a(9) =16398a(10) =36879a(11) =81936a(12) =180241a(13) =393234a(14) =851987a(15) =1835028a(16) =3932181a(17) =8388630a(18) =17825815a(19) =37748760a(20) =79691801a(21) =167772186a(22) =352321563a(23) =738197532a(24) =1543503901a(25) =3221225502a(26) =6710886431a(27) =13958643744