Triangle read by rows: T(n,k) is the number of graphs with n vertices with vertex cover number k-1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =3a(8) =6a(9) =1a(10) =1a(11) =4a(12) =15a(13) =13a(14) =1a(15) =1a(16) =5a(17) =30a(18) =82a(19) =37a(20) =1a(21) =1a(22) =6a(23) =51a(24) =301a(25) =578a(26) =106a(27) =1a(28) =1a(29) =7