Column 4 of square array A156628.

Terms

a(0) =1a(1) =5a(2) =28a(3) =181a(4) =1333a(5) =11029a(6) =101351a(7) =1024949a(8) =11320359a(9) =135679037a(10) =1754890039a(11) =24375607333a(12) =362034474975