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A002457
(2n+1)!/n!^2.
(Formerly M4198 N1752)
+0
61
1, 6, 30, 140, 630, 2772, 12012, 51480, 218790, 923780, 3879876, 16224936, 67603900, 280816200, 1163381400, 4808643120, 19835652870, 81676217700, 335780006100, 1378465288200, 5651707681620, 23145088600920, 94684453367400
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Maintained by
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
AT&T Labs Research
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