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A234558 Number of (n+1) X (2+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings). 1
220, 546, 1240, 3384, 8416, 24420, 64240, 194124, 527920, 1640076, 4548400, 14411004, 40441936, 130023180, 367611280, 1195404444, 3396165040, 11145399276, 31767426160, 105049443324, 300084387856, 998758590540, 2857390403920 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +30*a(n-2) -132*a(n-3) -331*a(n-4) +1720*a(n-5) +1530*a(n-6) -11280*a(n-7) -1324*a(n-8) +39136*a(n-9) -12360*a(n-10) -67968*a(n-11) +39456*a(n-12) +46080*a(n-13) -34560*a(n-14)
EXAMPLE
Some solutions for n=5:
4 0 4 2 2 2 4 4 4 3 1 3 0 0 0 0 4 0 0 0 0
2 2 2 0 4 0 0 4 0 2 4 2 4 0 4 4 4 4 0 4 0
4 0 4 1 1 1 4 4 4 4 2 4 4 4 4 0 4 0 4 4 4
1 1 1 4 0 4 4 0 4 0 2 0 4 0 4 1 1 1 4 0 4
0 4 0 2 2 2 3 3 3 3 1 3 4 4 4 0 4 0 3 3 3
3 3 3 0 4 0 0 4 0 2 4 2 4 0 4 4 4 4 0 4 0
CROSSREFS
Column 2 of A234564.
Sequence in context: A175738 A260203 A184543 * A211816 A135807 A258545
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 28 2013
STATUS
approved

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Last modified June 23 01:45 EDT 2024. Contains 373629 sequences. (Running on oeis4.)