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A251385 Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock summing to 2 3 4 5 or 6 1
4585, 271393, 16036923, 948010753, 56040713651, 3312804237391, 195833921630923, 11576574968972023, 684340522656108629, 40454275333788296091, 2391424062526227373613, 141367234975433997443721 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A251390

LINKS

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

FORMULA

Empirical: a(n) = 63*a(n-1) -155*a(n-2) -4658*a(n-3) +12612*a(n-4) +104334*a(n-5) -242452*a(n-6) -787537*a(n-7) +1342994*a(n-8) +1584245*a(n-9) -2822088*a(n-10) -447621*a(n-11) +1812174*a(n-12) -339424*a(n-13) -296064*a(n-14) +90240*a(n-15)

EXAMPLE

Some solutions for n=1

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

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

CROSSREFS

Sequence in context: A230947 A205231 A231022 * A185470 A004537 A204655

Adjacent sequences: A251382 A251383 A251384 * A251386 A251387 A251388

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 01 2014

STATUS

approved

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Last modified January 31 21:41 EST 2023. Contains 359981 sequences. (Running on oeis4.)