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A271028 Number of nXnXn triangular 0..2 arrays with some element less than a w, nw or ne neighbor exactly once. 1
0, 8, 72, 450, 2420, 12010, 56754, 259628, 1160936, 5105144, 22166760, 95301932, 406510934, 1722863088, 7263024536, 30481913682, 127442700854, 531088604958, 2206913662766, 9147940180122, 37836235984334, 156187232759706 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A271034.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..30

EXAMPLE

Some solutions for n=4

.....0........1........0........0........1........2........0........0

....0.0......1.1......0.1......0.0......1.1......2.2......1.2......0.2

...0.0.0....1.1.2....1.1.1....2.0.1....0.1.1....0.2.2....2.2.2....0.2.2

..0.2.2.1..0.2.2.2..0.1.1.1..2.2.2.2..0.1.1.1..0.2.2.2..0.2.2.2..0.1.2.2

CROSSREFS

Cf. A271034.

Sequence in context: A143945 A239095 A189954 * A180288 A082141 A304826

Adjacent sequences:  A271025 A271026 A271027 * A271029 A271030 A271031

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 29 2016

STATUS

approved

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Last modified July 21 02:02 EDT 2019. Contains 325189 sequences. (Running on oeis4.)