First column of A217202.

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =28a(5) =131a(6) =690a(7) =4033a(8) =25864a(9) =180265a(10) =1354458a(11) =10898823a(12) =93407828a(13) =848739867a(14) =8143768538a(15) =82229315137a(16) =871067808272