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A152502 1/12 of the number of permutations of 3 indistinguishable copies of 1..n with exactly 5 local maxima. 1
0, 0, 1, 7274, 6251162, 2764274116, 897380159188, 247392790837624, 62200280199674352, 14820288466400312448, 3420153590479988396800, 774303834249035054901248, 173288568985609322651099136, 38513999874946087671220207616, 8524401267844398602674455314432 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

PROG

(PARI) \\ PeaksBySig defined in A334774.

a(n) = {PeaksBySig(vector(n, i, 3), [4])[1]/12} \\ Andrew Howroyd, May 12 2020

CROSSREFS

Cf. A152499, A334774.

Sequence in context: A253529 A297880 A084276 * A251226 A260000 A303876

Adjacent sequences:  A152499 A152500 A152501 * A152503 A152504 A152505

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 06 2008

EXTENSIONS

Terms a(9) and beyond from Andrew Howroyd, May 12 2020

STATUS

approved

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Last modified December 6 22:42 EST 2021. Contains 349567 sequences. (Running on oeis4.)