Odd bisection of A173610.

Terms

a(0) =1a(1) =4a(2) =25a(3) =144a(4) =1024a(5) =7396a(6) =51076a(7) =345744a(8) =2547216a(9) =19114384a(10) =145564225a(11) =1111822336a(12) =8343726336a(13) =62292173056a(14) =459542986816