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A225965
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Number of permutations of [n] having exactly 4 strong fixed blocks.
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2
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1, 13, 117, 928, 7125, 55527, 451472, 3896347, 36098855, 361638248, 3932908263, 46483325765, 596325240445, 8278698772954, 123863754811374, 1988038987565688, 34070987657660446, 620747700139873322, 11975106447284305656, 243741719070454243530
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OFFSET
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10,2
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COMMENTS
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See A186373 for the definition of strong fixed blocks.
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LINKS
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FORMULA
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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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