Number of graphs with n nodes and n-4 edges.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =2a(6) =5a(7) =11a(8) =25a(9) =66a(10) =172a(11) =485a(12) =1446a(13) =4541a(14) =15036a(15) =52496a(16) =192218a(17) =737248a(18) =2952621a(19) =12313532a(20) =53336122a(21) =239380403a(22) =1110793092a(23) =5318743428a(24) =26233496486a(25) =133074975399