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A000486
One half of the number of permutations of [n] such that the differences have 4 runs with the same signs.
(Formerly M5011 N2158)
+0
4
16, 150, 926, 4788, 22548, 100530, 433162, 1825296, 7577120, 31130190, 126969558, 515183724, 2082553132, 8395437930, 33776903714, 135691891272, 544517772984, 2183315948550, 8748985781230, 35043081823140, 140313684667076
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.
AT&T Labs Research
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