A068270 - OEIS

%I #9 Apr 27 2012 17:39:57

%S 1,6517,13841287219,9580458187250990407,

%T 2161111220298293067819628379911,

%U 158872597397775739573835110149847235229271675,3806290340846629510463844992746098005507806101928649895595171,29719114772241665792629546781476756531800106771541628945462624575440369135473679

%N 1/20 the number of colorings of an n X n square array with 20 colors.

%Y Cf. A068239-A068305, A000332, A002417, A027441, A182368, A182406.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 24 2002

%E a(5)-a(8) from _Alois P. Heinz_, Apr 27 2012