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A180372 1/9 the number of triangular nXnXn arrays of integers in 1..9 with no element or any of its neighbors having the same value 0
1, 56, 6720, 1290240, 392232960 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..5.

CROSSREFS

Sequence in context: A278777 A202565 A213693 * A255960 A201240 A329104

Adjacent sequences:  A180369 A180370 A180371 * A180373 A180374 A180375

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 01 2010

STATUS

approved

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Last modified March 30 11:16 EDT 2020. Contains 333125 sequences. (Running on oeis4.)