Triangle read by rows giving number of ways to glue sides of a 2n-gon so as to produce a surface of genus g.

A035309

Triangle read by rows giving number of ways to glue sides of a 2n-gon so as to produce a surface of genus g.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =1a(4) =5a(5) =10a(6) =14a(7) =70a(8) =21a(9) =42a(10) =420a(11) =483a(12) =132a(13) =2310a(14) =6468a(15) =1485a(16) =429a(17) =12012a(18) =66066a(19) =56628a(20) =1430a(21) =60060a(22) =570570a(23) =1169740a(24) =225225a(25) =4862a(26) =291720a(27) =4390386a(28) =17454580a(29) =12317877

External references