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A165399 Number of slanted 7Xn (i=1..7)X(j=i..n+i-1) 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, 4 in the lower right corner, and with no element having more than 3 neighbors with the same value 0
11, 0, 7748, 70658, 1700146, 30346872, 564638514 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..8.

EXAMPLE

One solution for n=8

...1.1.2.2.2.2.2.2............

.....1.1.2.2.2.3.2.2..........

.......1.2.3.2.3.2.2.2........

.........3.3.2.3.2.3.3.4......

...........3.3.3.2.3.4.4.4....

.............3.3.2.3.3.3.4.4..

...............3.3.3.3.3.3.4.4

CROSSREFS

Sequence in context: A277560 A073865 A036931 * A157712 A266379 A158215

Adjacent sequences:  A165396 A165397 A165398 * A165400 A165401 A165402

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 17 2009

STATUS

approved

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Last modified November 29 07:48 EST 2021. Contains 349416 sequences. (Running on oeis4.)