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A270612 Number of 7X7X7 triangular 0..n arrays with some element plus some adjacent element totalling n+1 or n-1 exactly once. 0
0, 0, 8708857332, 98204118828408, 9214293422949066, 4757551848002860896, 285369749616515150016, 32625021173112501378696, 1060574342507074466039772, 42481155976455567861014856 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 7 of A270606.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

........0..............3..............3..............0..............0

.......3.3............1.0............3.0............3.3............0.0

......0.0.3..........0.0.0..........0.0.0..........0.0.3..........0.3.0

.....0.0.3.0........0.0.1.0........0.0.0.0........0.0.3.3........0.0.3.2

....0.0.0.3.3......0.0.0.0.0......0.0.0.3.3......0.0.0.0.2......0.0.0.3.3

...0.0.0.0.3.3....0.0.0.0.3.0....0.0.0.0.3.0....0.0.0.0.3.3....0.0.0.0.3.3

..0.0.0.0.0.0.2..0.0.0.0.0.3.0..0.0.0.0.1.0.0..0.0.0.0.0.3.2..0.0.0.0.3.3.3

CROSSREFS

Cf. A270606.

Sequence in context: A181746 A185429 A154876 * A331412 A204407 A144651

Adjacent sequences:  A270609 A270610 A270611 * A270613 A270614 A270615

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 20 2016

STATUS

approved

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Last modified May 25 11:27 EDT 2020. Contains 334592 sequences. (Running on oeis4.)