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1, 1, 3, 7, 20, 52, 152, 432, 1292, 3876, 11900, 36856, 115728, 366348, 1170280, 3764080, 12186584, 39673332, 129812956, 426648632, 1407939880, 4663160064, 15496048156, 51650777864, 172639344440, 578511221636, 1943155984792
(list;
graph;
refs;
listen;
history;
text;
internal format)
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