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A164750 Number of nX4 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
33, 730, 8181, 66970, 454001, 2710440, 14765875, 75078360, 361767973, 1669896490, 7442607455, 32219919102, 136108600539, 563096090012, 2288108822659, 9153641479832, 36122611753603, 140843294581018, 543321531506705 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

R. H. Hardin, Table of n, a(n) for n=2..21

EXAMPLE

Some solutions for n=3

...1.3.3.2...1.1.2.2...1.2.2.2...1.3.3.2...1.2.2.2...1.1.1.2...1.1.1.2

...1.3.4.2...1.1.2.4...2.2.2.4...1.1.3.2...1.2.2.4...1.3.3.4...1.3.3.4

...3.3.4.4...3.1.1.4...3.3.2.4...3.3.3.4...3.3.4.4...3.3.3.4...3.3.4.4

------

...1.1.1.2...1.1.2.2...1.1.1.2...1.1.2.2...1.1.1.2...1.1.1.2...1.1.3.2

...3.3.2.2...3.1.2.4...4.4.4.4...1.1.1.1...1.3.1.2...1.3.1.4...3.1.3.2

...3.4.4.4...3.4.4.4...3.3.4.4...3.3.1.4...3.3.1.4...3.3.1.4...3.3.3.4

CROSSREFS

Sequence in context: A025130 A081141 A021021 * A100788 A051565 A014931

Adjacent sequences:  A164747 A164748 A164749 * A164751 A164752 A164753

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 24 2009

STATUS

approved

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Last modified September 29 05:09 EDT 2022. Contains 357082 sequences. (Running on oeis4.)