A trisection of A163129.

Terms

a(0) =1a(1) =30a(2) =441a(3) =4431a(4) =35094a(5) =235053a(6) =1386027a(7) =7384578a(8) =36192519a(9) =165311094a(10) =710631279a(11) =2897149824a(12) =11270295093a(13) =42043460145a(14) =151025654781a(15) =524199355128