A180372 - OEIS

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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

1, 56, 6720, 1290240, 392232960

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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