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A251235 Number of (n+1) X (7+1) 0..3 arrays with every 2 X 2 subblock summing to 6 and no 2 X 2 subblock having exactly two nonzero entries. 1
27714, 42850, 71322, 129378, 250622, 514950, 1112526, 2511890, 5892002, 14279706, 35575142, 90692606, 235679686, 622362410, 1666024058, 4512772642, 12352459294, 34135460774, 95175625390, 267630015058, 758790404898, 2168797835866 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A251236.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..112

FORMULA

Empirical: a(n) = 13*a(n-1) -63*a(n-2) +122*a(n-3) +13*a(n-4) -371*a(n-5) +317*a(n-6) +308*a(n-7) -370*a(n-8) -144*a(n-9) +128*a(n-10) +48*a(n-11).

EXAMPLE

Some solutions for n=4:

..2..0..2..2..2..1..1..1....2..2..2..1..1..2..2..0....2..0..3..1..3..1..2..1

..1..3..1..1..1..2..2..2....1..1..1..2..2..1..1..3....2..2..1..1..1..1..2..1

..2..0..2..2..2..1..1..1....2..2..2..1..1..2..2..0....1..1..2..2..2..2..1..2

..2..2..2..0..2..1..3..1....1..1..1..2..2..1..1..3....3..1..2..0..2..0..3..0

..1..1..1..3..1..2..0..2....2..2..2..1..1..2..2..0....2..0..3..1..3..1..2..1

CROSSREFS

Cf. A251236.

Sequence in context: A101214 A202589 A079321 * A023198 A230608 A204831

Adjacent sequences:  A251232 A251233 A251234 * A251236 A251237 A251238

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 30 2014

STATUS

approved

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Last modified October 19 03:31 EDT 2019. Contains 328211 sequences. (Running on oeis4.)