Bisection of A136704.

Terms

a(0) =1a(1) =5a(2) =30a(3) =205a(4) =1476a(5) =11070a(6) =85410a(7) =672605a(8) =5380830a(9) =43584804a(10) =356602950a(11) =2941974270a(12) =24441017580a(13) =204257075490