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A302226 Number of 3 X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 2
0, 11, 43, 164, 760, 3425, 15569, 70323, 318438, 1441136, 6522237, 29519913, 133601253, 604673484, 2736676090, 12385962613, 56057588893, 253711291691, 1148272314748, 5196968663084, 23520972129705, 106453623089577 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A302224.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +17*a(n-2) +12*a(n-3) -59*a(n-4) -83*a(n-5) +10*a(n-6) +87*a(n-7) +108*a(n-8) +22*a(n-9) -104*a(n-10) -71*a(n-11) +2*a(n-13) +a(n-14) +2*a(n-15) for n>17.

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A302224.

Sequence in context: A142039 A196153 A213763 * A201714 A269422 A259798

Adjacent sequences:  A302223 A302224 A302225 * A302227 A302228 A302229

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 03 2018

STATUS

approved

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Last modified August 12 22:46 EDT 2022. Contains 356077 sequences. (Running on oeis4.)