login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A234684 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 5 (constant-stress 1 X 1 tilings). 1
1148, 4416, 16580, 69336, 281612, 1253088, 5385236, 25119456, 112545548, 544181136, 2514628340, 12495760896, 59077785452, 299739293328, 1441310414996, 7429688790336, 36177693563468, 188779231755216, 927888726542900 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) +136*a(n-2) -1036*a(n-3) -7837*a(n-4) +67291*a(n-5) +245614*a(n-6) -2526790*a(n-7) -4355332*a(n-8) +60808804*a(n-9) +36086728*a(n-10) -982312744*a(n-11) +135510432*a(n-12) +10839179904*a(n-13) -6945594624*a(n-14) -81450996480*a(n-15) +81465827328*a(n-16) +407151166464*a(n-17) -514409232384*a(n-18) -1284949370880*a(n-19) +1874710241280*a(n-20) +2296420761600*a(n-21) -3685898649600*a(n-22) -1755758592000*a(n-23) +3009871872000*a(n-24).
EXAMPLE
Some solutions for n=4:
1 1 2 5 1 0 1 5 2 4 4 4 6 6 6 5 1 5 0 4 4
5 0 6 0 1 5 5 4 6 6 1 6 6 1 6 5 6 5 6 5 0
2 2 3 0 6 5 0 4 1 2 2 2 3 3 3 0 6 0 6 0 0
1 6 2 5 6 0 2 1 3 0 5 0 5 0 5 0 1 0 1 0 5
2 2 3 0 6 5 1 5 2 6 6 6 5 5 5 5 1 5 1 5 5
CROSSREFS
Column 2 of A234690.
Sequence in context: A031785 A274297 A074255 * A270513 A233944 A329520
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2013
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)