a(n) = A010575(n)/8 for n>0.

Terms

a(0) =1a(1) =7a(2) =49a(3) =337a(4) =2323a(5) =15895a(6) =108907a(7) =743275a(8) =5076727a(9) =34593817a(10) =235848025a(11) =1605431161a(12) =10932074707a(13) =74359524127a(14) =505919033077