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A229509 Number of defective 3-colorings of an nX7 0..2 array connected diagonally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..2 order 1
0, 36864, 1617408, 66764736, 2591476416, 97662620160, 3594819388032, 130060929470976, 4641452248481280, 163824460625170944, 5730178115023705728, 198917197365436687872, 6861092028565088103552, 235357133324860943359488 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A229510

LINKS

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

FORMULA

Empirical: a(n) = 78*a(n-1) -1287*a(n-2) -35964*a(n-3) +1117233*a(n-4) +2786238*a(n-5) -319372713*a(n-6) +1257787440*a(n-7) +44761084056*a(n-8) -341244958320*a(n-9) -3277644180408*a(n-10) +38034583303392*a(n-11) +107407886665608*a(n-12) -2310987437840016*a(n-13) +670615070938488*a(n-14) +81246940478399232*a(n-15) -175581039433630896*a(n-16) -1642000043393779680*a(n-17) +6047215760091910320*a(n-18) +17688174604284225600*a(n-19) -102577837211971196400*a(n-20) -66593077133653908000*a(n-21) +963194364822483846000*a(n-22) -503839230173491680000*a(n-23) -4917956815925112240000*a(n-24) +6476674130582292000000*a(n-25) +11618360328126193200000*a(n-26) -25622007549556320000000*a(n-27) -3568779622973916000000*a(n-28) +35687796229739160000000*a(n-29) -20589113209464900000000*a(n-30) for n>31

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A251386 A175748 A204104 * A223304 A190383 A051393

Adjacent sequences:  A229506 A229507 A229508 * A229510 A229511 A229512

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 25 2013

STATUS

approved

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Last modified September 27 03:21 EDT 2020. Contains 337380 sequences. (Running on oeis4.)