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A229476 Number of defective 4-colorings of an n X 5 0..3 array connected horizontally, antidiagonally and vertically with exactly one mistake, and colors introduced in row-major 0..3 order. 1
20, 1312, 23964, 360912, 5068384, 68447552, 900320160, 11614790144, 147614682208, 1853886660416, 23058698415136, 284513215031168, 3486867165130720, 42487662072402880, 515141200042010528 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A229479.

LINKS

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

FORMULA

Empirical: a(n) = 44*a(n-1) - 838*a(n-2) + 9452*a(n-3) - 73265*a(n-4) + 422560*a(n-5) - 1882320*a(n-6) + 6531392*a(n-7) - 17307072*a(n-8) + 32474112*a(n-9) - 31011840*a(n-10) - 38977536*a(n-11) + 220663808*a(n-12) - 419692544*a(n-13) + 332922880*a(n-14) + 233046016*a(n-15) - 839122944*a(n-16) + 788529152*a(n-17) - 268435456*a(n-18) for n > 19.

EXAMPLE

Some solutions for n=3:

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

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

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

CROSSREFS

Cf. A229479.

Sequence in context: A338961 A274645 A005982 * A177597 A127847 A193309

Adjacent sequences:  A229473 A229474 A229475 * A229477 A229478 A229479

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 24 2013

STATUS

approved

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Last modified September 19 13:03 EDT 2021. Contains 347556 sequences. (Running on oeis4.)