

A292880


Number of sequences of balls colored with at most n colors such that exactly three balls are of a color seen earlier in the sequence.


0



1, 32, 633, 10744, 173705, 2798376, 45930577, 777101648, 13638044529, 249079033360, 4741200949001, 94104123729672, 1947270419971513, 41985753920469464, 942531024150018465, 22009425078894009376, 534085741053864862817, 13454221423402868473728, 351483652960252663137049, 9512821482149972773978520
(list;
graph;
refs;
listen;
history;
text;
internal format)




