Duplicate of A045983.

Terms

a(0) =1a(1) =2a(2) =2a(3) =2a(4) =54a(5) =91a(6) =141a(7) =141a(8) =44360a(9) =48919a(10) =218972a(11) =526095a(12) =526095a(13) =526095