Number of highly irregular connected graphs with n nodes.

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =0a(5) =1a(6) =0a(7) =3a(8) =3a(9) =13a(10) =21a(11) =110a(12) =474a(13) =2545a(14) =18696a(15) =136749a(16) =1447003a(17) =18772435a(18) =303050079a(19) =6239596472