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A302225 Number of 2Xn 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 4
0, 3, 14, 45, 146, 537, 1934, 6861, 24386, 86913, 309638, 1102677, 3927050, 13986633, 49814510, 177416541, 631877618, 2250466449, 8015156630, 28546401765, 101669514458, 362101348953, 1289643083966, 4593131945709, 16358681988674 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A302224.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 2*a(n-1) +3*a(n-2) +6*a(n-3) +10*a(n-4) +4*a(n-5) for n>6

EXAMPLE

Some solutions for n=5

..0..0..0..1..0. .0..0..1..1..0. .0..0..0..1..0. .0..0..0..1..1

..0..1..1..0..1. .0..1..0..0..0. .0..1..1..0..0. .0..1..1..0..1

CROSSREFS

Cf. A302224.

Sequence in context: A058389 A261481 A059672 * A032316 A032225 A032150

Adjacent sequences:  A302222 A302223 A302224 * A302226 A302227 A302228

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 03 2018

STATUS

approved

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Last modified August 19 12:57 EDT 2022. Contains 356228 sequences. (Running on oeis4.)