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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A152496 revision #3 A152496 1/3 of the number of permutations of 2 indistinguishable copies of 1..n with exactly 4 local maxima. 2 0, 0, 0, 113, 16565, 1216902, 65819156, 3026987243, 126794945523, 5020186173560 (list; graph; refs; listen; history; text; internal format) OFFSET 1,4 LINKS Table of n, a(n) for n=1..10. CROSSREFS Sequence in context: A218371 A218637 A218241 * * A176825 A187703 Adjacent sequences: A152493 A152494 A152495 * A152497 A152498 A152499 KEYWORD nonn AUTHOR R. H. Hardin, Dec 06 2008 STATUS approved

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Last modified August 31 11:25 EDT 2024. Contains 375560 sequences. (Running on oeis4.)