| 1, 1, 2, 6, 19, 63, 216, 759, 2717, 9867, 36244, 134368, 501942, 1886966, 7131840, 27078705, 103221585, 394827315, 1514797020, 5827192140, 22469489130, 86825411010, 336145233840, 1303626531870, 5063559897474, 19695844095678, 76710709889576, 299125464317904
(list; graph; listen)
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