Number of polygonal graphs.

Terms

a(0) =1a(1) =1a(2) =4a(3) =2a(4) =7a(5) =5a(6) =15a(7) =6a(8) =37a(9) =13a(10) =36a(11) =32a(12) =37a(13) =34a(14) =73a(15) =58a(16) =183a(17) =150a(18) =262a(19) =186a(20) =1009a(21) =420a(22) =707a(23) =703a(24) =760a(25) =1180a(26) =4639