Accumulation of the upper left triangle used in binomial transform of nonnegative integers.

Terms

a(0) =0a(1) =2a(2) =11a(3) =39a(4) =114a(5) =300a(6) =741a(7) =1757a(8) =4052a(9) =9162a(10) =20415a(11) =44979a(12) =98214a(13) =212888a(14) =458633a(15) =982905a(16) =2097000a(17) =4456278a(18) =9436995a(19) =19922735a(20) =41942810a(21) =88080132a(22) =184549101a(23) =385875669a(24) =805306044a(25) =1677721250a(26) =3489660551a(27) =7247756907a(28) =15032385102a(29) =31138512432