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A165398 Number of slanted 6Xn (i=1..6)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
9, 8, 4708, 40058, 598332, 7051772, 81612367, 869819150 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..9.

EXAMPLE

All solutions for n=3

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

.....1.2.2.............1.1.1.............1.2.2.............1.1.1........

.......2.2.3.............1.1.1.............2.2.2.............1.1.4......

.........2.3.3.............4.4.4.............4.4.4.............1.4.4....

...........3.3.4.............4.4.4.............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..........

.....1.1.1.............1.2.2.............1.1.1.............1.2.2........

.......1.1.1.............2.2.4.............1.1.3.............2.2.2......

.........3.3.3.............2.4.4.............1.3.3.............3.3.3....

...........3.3.4.............4.4.4.............3.3.4.............3.3.4..

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

CROSSREFS

Sequence in context: A038298 A013439 A180680 * A021105 A176537 A019891

Adjacent sequences:  A165395 A165396 A165397 * A165399 A165400 A165401

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 17 2009

STATUS

approved

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Last modified November 17 23:26 EST 2019. Contains 329242 sequences. (Running on oeis4.)