Binomial coefficient C(2n,n-12).

Terms

a(0) =1a(1) =26a(2) =378a(3) =4060a(4) =35960a(5) =278256a(6) =1947792a(7) =12620256a(8) =76904685a(9) =445891810a(10) =2481256778a(11) =13340783196a(12) =69668534468a(13) =354860518600