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A234660 Number of (n+1) X (2+1) 0..6 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
1820, 9774, 52646, 286668, 1566596, 8659270, 48048220, 269752200, 1520415050, 8671291020, 49644175568, 287539714338, 1671300725440, 9823825117164, 57918470971102, 345126319941768, 2061436669618116, 12436683541246942 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 24*a(n-1) -116*a(n-2) -1573*a(n-3) +17655*a(n-4) -7512*a(n-5) -599532*a(n-6) +2201681*a(n-7) +4899218*a(n-8) -40315144*a(n-9) +38576320*a(n-10) +130316460*a(n-11) -132305400*a(n-12) -263116800*a(n-13) +8496000*a(n-14) +134568000*a(n-15) +45360000*a(n-16).
EXAMPLE
Some solutions for n=3:
3 3 0 5 6 5 4 2 2 4 1 5 6 2 3 3 0 3 5 1 5
0 4 5 6 3 6 2 4 0 1 2 2 4 4 1 2 3 2 0 0 0
4 4 1 4 5 4 5 3 3 5 2 6 1 5 6 5 2 5 1 5 1
4 0 1 3 0 3 4 6 2 2 3 3 1 1 6 3 4 3 3 3 3
CROSSREFS
Column 2 of A234665.
Sequence in context: A353807 A326236 A156636 * A238030 A233719 A174770
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2013
STATUS
approved

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Last modified July 24 15:18 EDT 2024. Contains 374584 sequences. (Running on oeis4.)