Third row of array in A187617.

Terms

a(0) =1a(1) =5a(2) =36a(3) =281a(4) =2245a(5) =18061a(6) =145601a(7) =1174500a(8) =9475901a(9) =76455961a(10) =616891945a(11) =4977472781a(12) =40161441636a(13) =324048393905