Column 1 of triangle A185624.

Terms

a(0) =1a(1) =2a(2) =7a(3) =28a(4) =142a(5) =913a(6) =7244a(7) =69004a(8) =771359a(9) =9933242a(10) =145148660a(11) =2376879719a(12) =43167728519a(13) =861914166441