Triangle read by rows: T(n,k) is the number of n edge non-orientable genus k maps.

Terms

a(0) =1a(1) =4a(2) =2a(3) =19a(4) =16a(5) =8a(6) =106a(7) =137a(8) =128a(9) =47a(10) =709a(11) =1254a(12) =1890a(13) =1372a(14) =473a(15) =5356a(16) =12597a(17) =27036a(18) =31007a(19) =22556a(20) =7190a(21) =44558a(22) =133518a(23) =379491a(24) =611322a(25) =704066a(26) =469632a(27) =144904a(28) =397146a(29) =1464725