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1, 3, 8, 27, 90, 320, 1170, 4243, 15700, 58415, 219547, 831826, 3160495, 12062741, 46187360, 177436402, 683765925, 2640846975, 10221025773, 39630943814, 153924315307, 598776610777, 2332494389552, 9097468059843
(list; graph; refs; listen; history; internal format)
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