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A165387 Number of slanted 4Xn (i=1..4)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 1
5, 104, 1409, 11960, 85841, 534816, 3017385, 15787165, 77891237, 366749318, 1662432947, 7302379696, 31240817911, 130688934607, 536275945765, 2164142120076, 8606910817129, 33793586661904, 131185521194097 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

R. H. Hardin, Table of n, a(n) for n=2..22

EXAMPLE

Some solutions for n=4

...1.1.2.2.........1.1.4.2.........1.1.2.2.........1.1.2.2......

.....1.3.2.2.........4.4.4.4.........1.3.3.3.........1.2.2.2....

.......3.3.2.2.........4.3.4.4.........3.3.3.3.........3.3.2.2..

.........3.3.3.4.........3.3.4.4.........3.3.4.4.........3.2.2.4

------

...1.1.2.2.........1.1.1.2.........1.2.2.2.........1.1.2.2......

.....1.1.2.2.........1.2.2.2.........2.2.2.2.........1.1.2.1....

.......1.1.2.4.........3.3.4.4.........3.3.4.4.........1.1.1.1..

.........3.4.4.4.........3.3.4.4.........3.4.4.4.........3.3.4.4

------

...1.1.1.2.........1.1.1.2.........1.1.2.2.........1.1.2.2......

.....1.1.3.3.........2.2.2.2.........2.2.4.4.........3.3.2.2....

.......1.3.4.4.........2.2.2.4.........2.2.4.4.........3.3.2.2..

.........3.3.4.4.........3.4.4.4.........3.4.4.4.........3.3.4.4

CROSSREFS

Sequence in context: A007619 A163212 A163154 * A156848 A057016 A193340

Adjacent sequences:  A165384 A165385 A165386 * A165388 A165389 A165390

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 17 2009

STATUS

approved

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Last modified January 22 02:46 EST 2022. Contains 350481 sequences. (Running on oeis4.)