Column 5 of table A125781.

Terms

a(0) =1a(1) =6a(2) =29a(3) =141a(4) =739a(5) =4276a(6) =27483a(7) =195978a(8) =1544074a(9) =13371684a(10) =126591212a(11) =1303252476a(12) =14517950305a(13) =174196495882