| 1, 2, 4, 11, 28, 78, 213, 598, 1670, 4723, 13356, 37986, 108193, 309169, 884923, 2538369, 7292170, 20982220, 60451567, 174385063, 503600439, 1455827279, 4212464112, 12199373350, 35357580112, 102552754000, 297651592188, 864460682777
(list; graph; listen)
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