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A204050 Number of (n+2)X4 0..3 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order 1
10447, 112362, 756338, 5883499, 45689226, 361569647, 2777961511, 21501371450, 166160922266, 1291534099042, 10003568767059, 77546108106626, 600524809842067, 4655276167460819, 36072762678121778, 279581381767181194 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A204056

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +5*a(n-2) -99*a(n-3) +724*a(n-4) -2536*a(n-5) -3590*a(n-6) +1687*a(n-7) +11959*a(n-8) +163995*a(n-9) +260790*a(n-10) -1081279*a(n-11) +60097*a(n-12) -364566*a(n-13) -8610867*a(n-14) +6484656*a(n-15) +14892705*a(n-16) +9662463*a(n-17) -7454322*a(n-18) -21790782*a(n-19) -17972280*a(n-20) +16159257*a(n-21) +13997529*a(n-22) -3470769*a(n-23) +1062882*a(n-24) -2539107*a(n-25) +531441*a(n-26) for n>27

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A010082 A068759 A183787 * A114126 A171352 A237179

Adjacent sequences:  A204047 A204048 A204049 * A204051 A204052 A204053

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 09 2012

STATUS

approved

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Last modified January 25 01:49 EST 2020. Contains 331229 sequences. (Running on oeis4.)