Triangle read by rows: number of P-graphs by number of edges and number of non-root nodes.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =10a(5) =3a(6) =1a(7) =30a(8) =44a(9) =4a(10) =1a(11) =70a(12) =284a(13) =134a(14) =5a(15) =1a(16) =140a(17) =1224a(18) =1594a(19) =329a(20) =6a(21) =1a(22) =252a(23) =4110a(24) =11330a(25) =6552a(26) =700a(27) =7a(28) =1a(29) =420