Column 3 of triangle A127082.

Terms

a(0) =1a(1) =4a(2) =26a(3) =192a(4) =1551a(5) =13416a(6) =122770a(7) =1180496a(8) =11883079a(9) =124992672a(10) =1372811900a(11) =15741602608a(12) =188470662702