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A234916 Number of (n+1) X (3+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). 1
376, 1128, 3684, 13336, 49056, 186500, 710304, 2755840, 10693364, 42087616, 165680800, 659882692, 2629088000, 10575205872, 42553878500, 172546960864, 699893575232, 2856015808196, 11657898710352, 47806906114000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 9*a(n-1) -2*a(n-2) -188*a(n-3) +413*a(n-4) +1077*a(n-5) -3828*a(n-6) -1678*a(n-7) +14385*a(n-8) -3643*a(n-9) -26998*a(n-10) +16004*a(n-11) +26132*a(n-12) -21362*a(n-13) -12072*a(n-14) +12608*a(n-15) +2016*a(n-16) -3096*a(n-17) +224*a(n-19).
EXAMPLE
Some solutions for n=5:
0 1 0 1 1 2 1 2 1 2 1 2 4 3 4 3 2 3 2 1
1 0 1 0 4 3 4 3 0 3 4 3 1 2 1 2 3 2 3 0
4 1 4 1 3 0 3 4 1 2 1 2 4 3 4 3 4 1 4 3
1 0 1 0 4 3 4 3 2 1 2 1 3 4 3 4 1 0 1 2
0 1 0 1 1 2 1 2 3 0 3 0 1 0 1 0 0 1 4 3
1 4 1 4 2 1 2 1 2 1 2 1 0 1 4 1 3 2 3 4
CROSSREFS
Column 3 of A234921.
Sequence in context: A008853 A188007 A251644 * A288916 A198640 A171489
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 01 2014
STATUS
approved

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Last modified April 13 06:32 EDT 2024. Contains 371638 sequences. (Running on oeis4.)