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1, 4, 16, 66, 296, 1334, 6322, 30930, 158008, 837530, 4624462, 26379128, 155536148, 944173842, 5898860754, 37848982610, 249347884600, 1684168485302, 11655678956456, 82532887947582, 597399961515754, 4414814240798968, 33281178413298246, 255687224968704234
(list;
graph;
refs;
listen;
history;
text;
internal format)
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