Convolution of A000716 and the positive integers.

Terms

a(0) =1a(1) =5a(2) =18a(3) =53a(4) =139a(5) =333a(6) =748a(7) =1592a(8) =3246a(9) =6379a(10) =12152a(11) =22524a(12) =40764a(13) =72213a(14) =125505a(15) =214378a(16) =360473a(17) =597450a(18) =977196a(19) =1578852a(20) =2522157a(21) =3986658a(22) =6239619a(23) =9675801a(24) =14874445a(25) =22679693a(26) =34314378a(27) =51539173a(28) =76875314a(29) =113913453