cp's OEIS Frontend

A128041 Triangle read by columns: number of n-node (unlabeled) graphs with girth k, for n >= 3, k >= 3.

%I A128041 #14 Jun 24 2023 13:41:04
%S A128041 1,4,1,20,3,1,118,15,2,1,937,59,8,2,1,11936,296,26,9,2,1,272771,1604,
%T A128041 101,28,8,2,1,11992996,11303,396,107,25,9,2,1,1018892793,102108,1744,
%U A128041 376,92,29,9,2,1,165089910412,1250114,8531,1457,321,113,30,10,2,1
%N A128041 Triangle read by columns: number of n-node (unlabeled) graphs with girth k, for n >= 3, k >= 3.
%e A128041 Number of n-node (unlabeled) graphs with girth k, for n >= 3, k >= 3.
%e A128041 .k..|.n=........3........4........5........6........7........8........9........10
%e A128041 ---------------------------------------------------------------------------------
%e A128041 .0..|...........0........0........0........0........0........0........0.........0
%e A128041 .1..|...........0........0........0........0........0........0........0.........0
%e A128041 .2..|...........0........0........0........0........0........0........0.........0
%e A128041 .3..|...........1........4.......20......118......937....11936...272771..11992996
%e A128041 .4..|...........0........1........3.......15.......59......296.....1604.....11303
%e A128041 .5..|...........0........0........1........2........8.......26......101.......396
%e A128041 .6..|...........0........0........0........1........2........9.......28.......107
%e A128041 .7..|...........0........0........0........0........1........2........8........25
%e A128041 .8..|...........0........0........0........0........0........1........2.........9
%e A128041 .9..|...........0........0........0........0........0........0........1.........2
%e A128041 10..|...........0........0........0........0........0........0........0.........1
%o A128041 (nauty) geng $n | countg --ng # _Martin Fuller_, May 03 2015
%Y A128041 Cf. A128042, A006787, A128236-A128243.
%K A128041 nonn,tabl
%O A128041 3,2
%A A128041 _Keith Briggs_, May 05 2007
%E A128041 Corrected and extended by _Martin Fuller_, May 01 2015