Number of graphs with n nodes, n+2 edges and no isolated vertices.

A006651

Number of graphs with n nodes, n+2 edges and no isolated vertices.

Terms

    a(0) =1a(1) =4a(2) =22a(3) =110a(4) =515a(5) =2272a(6) =9777a(7) =40752a(8) =166519a(9) =668134a(10) =2644988a(11) =10351321a(12) =40150556a(13) =154591610a(14) =591780559a(15) =2254880616a(16) =8561287942a(17) =32418230925a(18) =122522492807a(19) =462502319244

External references