Column 2 of array in A322770.

Terms

a(0) =5a(1) =18a(2) =70a(3) =299a(4) =1393a(5) =7023a(6) =38043a(7) =220054a(8) =1352082a(9) =8784991a(10) =60125371a(11) =432001747a(12) =3248914361a(13) =25508188118a(14) =208592396802