| 1, 4, 10, 29, 81, 230, 652, 1854, 5278, 15048, 42956, 122772, 351300, 1006344, 2885952, 8285001, 23809113, 68490060, 197211394, 568385609, 1639635613, 4734036134, 13679894484, 39562904855, 114507905551, 331674931656, 961408814434
(list; graph; listen)
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