Numerator of Cotesian number C(n,0).

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =7a(5) =19a(6) =41a(7) =751a(8) =989a(9) =2857a(10) =16067a(11) =434293a(12) =1364651a(13) =8181904909a(14) =90241897a(15) =5044289a(16) =15043611773a(18) =203732352169