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A210294 Half the number of (n+1)X3 0..3 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference 1
1578, 78628, 3913002, 194768054, 9694276684, 482519042626, 24016699289368, 1195397128587610, 59499195398348818, 2961488004421137772, 147403862192382974048, 7336818031079109775274, 365179704387717596682932 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A210300

LINKS

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

FORMULA

Empirical: a(n) = 44*a(n-1) +330*a(n-2) -1940*a(n-3) -9738*a(n-4) +33341*a(n-5) +57999*a(n-6) -257279*a(n-7) +188734*a(n-8) +117676*a(n-9) -161670*a(n-10) +4796*a(n-11) +34416*a(n-12) -4912*a(n-13) -1536*a(n-14)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A263525 A183637 A223399 * A203961 A253421 A023082

Adjacent sequences:  A210291 A210292 A210293 * A210295 A210296 A210297

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 19 2012

STATUS

approved

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Last modified December 8 14:18 EST 2021. Contains 349596 sequences. (Running on oeis4.)