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A246224
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Number of permutations of [n] with exactly four (possibly overlapping) occurrences of the consecutive step pattern given by the binary expansion of n, where 1=up and 0=down.
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2
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1, 0, 0, 0, 0, 0, 0, 0, 255577419, 0, 0, 9542007262728, 6774382288791, 0, 2426035607748545873, 7229099931331250350, 1033055991550105110, 2319374753629800000, 19452094129713604966805, 438500213962184713953125, 45449834784068599467011795
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OFFSET
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7,9
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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