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A165388 Number of slanted 5Xn (i=1..5)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, and 4 in the lower right corner 0
7, 168, 4569, 63740, 755947, 7834644, 74493401, 661071448, 5551999772, 44577303412 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..11.

EXAMPLE

Some solutions for n=3

...1.2.2...........1.1.2...........1.1.2...........1.1.2........

.....2.2.2...........1.1.1...........1.2.4...........1.1.1......

.......2.2.2...........1.3.3...........4.4.4...........1.4.4....

.........2.3.4...........3.3.3...........4.4.4...........4.4.4..

...........3.4.4...........3.4.4...........3.4.4...........3.4.4

------

...1.1.2...........1.1.2...........1.1.2...........1.1.2........

.....1.2.2...........2.2.2...........1.1.1...........1.1.1......

.......2.2.3...........2.2.3...........1.1.1...........1.1.3....

.........2.3.4...........3.3.4...........1.3.3...........1.3.4..

...........3.4.4...........3.4.4...........3.4.4...........3.4.4

------

...1.3.2...........1.1.2...........1.2.2...........1.1.2........

.....3.3.3...........1.1.1...........2.2.2...........1.1.1......

.......3.3.3...........3.3.3...........4.4.4...........1.1.1....

.........3.3.3...........3.3.4...........4.4.4...........4.4.4..

...........3.4.4...........3.4.4...........3.4.4...........3.4.4

CROSSREFS

Sequence in context: A192275 A009807 A220991 * A124126 A086373 A162131

Adjacent sequences:  A165385 A165386 A165387 * A165389 A165390 A165391

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 17 2009

STATUS

approved

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Last modified November 28 04:31 EST 2021. Contains 349400 sequences. (Running on oeis4.)