Column 5 of triangle A055907.

Terms

a(0) =1a(1) =10a(2) =56a(3) =240a(4) =854a(5) =2654a(6) =7412a(7) =18974a(8) =45173a(9) =101074a(10) =214361a(11) =433731a(12) =841921a(13) =1574765a(14) =2849215a(15) =5002411a(16) =8546675a(17) =14243335a(18) =23202995a(19) =37016099a(20) =57925111a(21) =89043169a(22) =134635403a(23) =200468817a(24) =294253144a(25) =426179565a(26) =609587498a(27) =861767228