A270515 - OEIS

A270515

Number of 7X7X7 triangular 0..n arrays with some element plus some adjacent element totalling n+1 exactly once.

230247, 12072484260, 35714928884139, 44967908021958960, 13296639688401609639, 2109167396478578514420, 150198194895042488122251, 6905544217424668588435776, 196451622904453301728770183

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OFFSET

1,1

COMMENTS

Row 7 of A270509.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=1

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

.......0.0............0.0............0.0............0.0............0.0

......0.0.1..........1.0.0..........1.0.0..........1.0.1..........0.0.0

.....1.0.0.1........0.1.0.1........0.1.0.0........0.0.0.0........0.1.0.1

....0.0.1.0.0......1.0.0.0.0......0.0.0.0.1......0.1.0.1.0......0.0.0.0.0

...0.0.0.0.0.0....0.0.0.0.0.0....0.1.0.0.0.0....0.0.1.0.0.0....0.0.0.0.0.1

..1.0.1.0.0.0.1..0.0.0.0.1.0.1..1.0.0.0.1.0.1..0.1.0.0.0.0.0..0.0.0.0.0.1.0

CROSSREFS

Cf. A270509.

Sequence in context: A234670 A324636 A015319 * A179624 A357826 A050998

Adjacent sequences: A270512 A270513 A270514 * A270516 A270517 A270518

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 18 2016

STATUS

approved