Number of bipartite graphs with 5 edges on nodes {1..n}.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =60a(6) =1701a(7) =14952a(8) =81228a(9) =331884a(10) =1116675a(11) =3256407a(12) =8500734a(13) =20306286a(14) =45093048a(15) =94189095a(16) =186736368a(17) =353904096a(18) =644842674a(19) =1134910242a(20) =1936817820a(21) =3215467584a(22) =5207403663a(23) =8245956642a(24) =12793342716a(25) =19481177100a(26) =29161079805a(27) =42967291185a(28) =62393475690