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1, 1, 1, 1, 4, 9, 36, 121, 529, 2209, 11236, 55225, 303601, 1692601, 9979281, 59923081, 373262400, 2364779641, 15343033689, 101095382025, 677435994225, 4598901695025, 31626631547536, 219871778549476, 1544481904210609, 10948878748872100, 78284374662902500
(list;
graph;
refs;
listen;
history;
text;
internal format)
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