Seventh column of triangle A055249.

Terms

a(0) =1a(1) =9a(2) =47a(3) =187a(4) =630a(5) =1898a(6) =5282a(7) =13866a(8) =34831a(9) =84575a(10) =199977a(11) =462973a(12) =1053804a(13) =2365704a(14) =5250660a(15) =11543700a(16) =25177005a(17) =54539205a(18) =117456115a(19) =251676495a(20) =536892146a(21) =1140875254a(22) =2415947382a(23) =5100306062a(24) =10737455195a(25) =22548620283