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A251233 Number of (n+1) X (5+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
2930, 5194, 9914, 20490, 44966, 103926, 250622, 626122, 1610186, 4240330, 11386550, 31076502, 85989998, 240797850, 681516362, 1947640474, 5616316454, 16333536118, 47886799742, 141482904522, 421114402730, 1262292036426 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A251236.

LINKS

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

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

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

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

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

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

CROSSREFS

Cf. A251236.

Sequence in context: A237079 A128149 A276671 * A251983 A251976 A251975

Adjacent sequences:  A251230 A251231 A251232 * A251234 A251235 A251236

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 30 2014

STATUS

approved

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Last modified January 25 19:09 EST 2020. Contains 331249 sequences. (Running on oeis4.)