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 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant stress 1X1 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

COMMENTS

Column 2 of A234690

LINKS

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

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

Sequence in context: A031785 A274297 A074255 * A270513 A233944 A329520

Adjacent sequences:  A234681 A234682 A234683 * A234685 A234686 A234687

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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 23 03:15 EST 2022. Contains 350504 sequences. (Running on oeis4.)