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A246222
Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive step pattern given by the binary expansion of n, where 1=up and 0=down.
2
99, 0, 13303, 530432, 2715243, 14872704, 712988175, 2114735616, 14553496947, 22338508875, 9307563626682, 839345640802598, 8486108520773778, 298020352385025000, 10432593658200450596, 210875469472380711300, 944599826416703171100, 12667164470975664000000
OFFSET
7,1
LINKS
CROSSREFS
Column k=2 of A242783.
Sequence in context: A097601 A113602 A097846 * A309232 A360376 A304140
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 19 2014
STATUS
approved