Antidiagonal sums of the convolution array A213571.

Terms

a(0) =1a(1) =8a(2) =36a(3) =124a(4) =367a(5) =988a(6) =2498a(7) =6048a(8) =14197a(9) =32576a(10) =73472a(11) =163508a(12) =360027a(13) =785908a(14) =1703294a(15) =3669240a(16) =7863393a(17) =16776120a(18) =35650300a(19) =75495980a(20) =159381831a(21) =335542348a(22) =704640826a(23) =1476392464a(24) =3087004877a(25) =6442447728a(26) =13421769208