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A086855 Number of permutations of length n with exactly 4 rising or falling successions. +0
3
0, 0, 0, 0, 0, 2, 22, 226, 2198, 22120, 236968, 2732268, 33940644, 453148422, 6480322210, 98907371822, 1605581578202, 27631315113916, 502618772515748, 9637245372790760, 194291040277517688, 4109014039030693578, 90968013940830446574, 2104072961763468757082 (list; graph; listen)
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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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