Duplicate of A070198.

Terms

a(0) =0a(1) =1a(2) =5a(3) =11a(4) =59a(5) =59a(6) =419a(7) =839a(8) =2519a(9) =2519a(10) =27719a(11) =27719a(12) =360359a(13) =360359a(14) =360359