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A229665 Number of defective 4-colorings of an nX1 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order 2
0, 0, 1, 3, 12, 50, 210, 861, 3416, 13140, 49230, 180455, 649572, 2302950, 8060234, 27900705, 95659440, 325241960, 1097691462, 3680494731, 12268315580, 40679151450, 134241199554, 441078226853, 1443528742152, 4707158941500 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Column 1 of A229672

LINKS

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

FORMULA

Empirical: a(n) = 12*a(n-1) -57*a(n-2) +136*a(n-3) -171*a(n-4) +108*a(n-5) -27*a(n-6) for n>9.

Empirical: g.f. x^3  -x^4*(-3+24*x-77*x^2+114*x^3-72*x^4+18*x^5) / ( (3*x-1)^3*(x-1)^3 ). - R. J. Mathar, Sep 29 2013

CROSSREFS

Sequence in context: A180283 A037765 A037653 * A092443 A108080 A113441

Adjacent sequences:  A229662 A229663 A229664 * A229666 A229667 A229668

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 27 2013

STATUS

approved

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Last modified October 1 17:45 EDT 2020. Contains 337444 sequences. (Running on oeis4.)