A270856 - OEIS

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A270856

Number of 7 X 7 X 7 triangular 0..n arrays with some element plus some adjacent element totalling n+1, n or n-1 exactly once.

0, 0, 460494, 4875050400, 5281372355106, 2104222937252028, 358240737864481086, 41234776662339168204, 2798233542174582927894, 142439611138184581460718

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

Row 7 of A270850.

LINKS

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

EXAMPLE

Some solutions for n=3

........0..............1..............1..............0..............1

.......0.1............0.1............0.0............0.1............0.0

......1.0.0..........0.0.0..........1.0.1..........0.0.0..........0.0.0

.....0.0.0.1........0.0.0.1........1.0.0.0........1.0.0.0........0.0.0.0

....0.0.0.1.0......0.0.0.0.0......0.0.1.0.1......0.1.0.0.0......0.0.0.1.0

...0.1.0.0.0.1....0.1.0.0.0.0....0.1.0.0.0.0....0.0.0.1.0.0....0.0.0.0.0.1

..1.0.0.0.1.0.0..0.0.0.0.0.0.1..1.0.0.1.0.0.1..1.0.0.0.0.0.1..0.0.0.0.0.1.0

CROSSREFS

Cf. A270850.

Sequence in context: A202600 A376166 A114671 * A295475 A205765 A216068

Adjacent sequences: A270853 A270854 A270855 * A270857 A270858 A270859

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 24 2016

STATUS

approved