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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
(list; graph; refs; listen; history; internal format)
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