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A205434 Number of (n+1)X3 0..3 arrays with every 2X2 subblock having the same number of equal edges, and new values 0..3 introduced in row major order 1
77, 833, 10275, 140423, 2052727, 31378965, 493169259, 7881048447, 127174581623, 2063732356701, 33596865282059, 547943986385703, 8945881980194071, 146138684496850565, 2388096648177576811, 39031992422458780335 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A205440

LINKS

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

FORMULA

Empirical: a(n) = 45*a(n-1) -775*a(n-2) +6501*a(n-3) -27165*a(n-4) +43819*a(n-5) +59551*a(n-6) -369405*a(n-7) +633750*a(n-8) -521280*a(n-9) +206064*a(n-10) -31104*a(n-11)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A046149 A222728 A223649 * A125581 A176632 A093277

Adjacent sequences:  A205431 A205432 A205433 * A205435 A205436 A205437

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 27 2012

STATUS

approved

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Last modified June 7 01:26 EDT 2020. Contains 334836 sequences. (Running on oeis4.)