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A087924 Number of ways of arranging the numbers 1 ... 3n into a 3 X n array so there is exactly one local maximum. 0
4, 208, 29568, 7452704, 2941306368, 1683453629440, 1323082429842432, 1370418864769445888, 1811764909105311267840, 2980039854936078219167744, 5972307516078119199647692800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..11.

CROSSREFS

A row of the array in A087783. Cf. A007846.

Sequence in context: A300152 A260639 A222282 * A201978 A081787 A293159

Adjacent sequences:  A087921 A087922 A087923 * A087925 A087926 A087927

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2003

STATUS

approved

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Last modified May 22 09:50 EDT 2022. Contains 353949 sequences. (Running on oeis4.)