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2, 4, 12, 48, 241, 1449, 10149, 81194, 730750, 7307505, 80382564, 964590768, 12539679995, 175555519936, 2633332799049, 42133324784795, 716266521341530, 12892797384147547, 244963150298803410, 4899263005976068208
(list; graph; refs; listen; history; internal format)
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