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A097900
Number of runs of length 1 in all permutations of [n]. (The permutation 3574162 has two runs of length 1: 357/4/16/2).
+0
3
1, 2, 7, 32, 180, 1200, 9240, 80640, 786240, 8467200, 99792000, 1277337600, 17643225600, 261534873600, 4140968832000, 69742632960000, 1244905998336000, 23475370254336000, 466306218233856000, 9731608032706560000
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 10 00:48 EST 2009. Contains 170565 sequences.
AT&T Labs Research
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