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!)
A234492 Number of (n+1) X (2+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings). 1
1834, 17022, 158288, 1483566, 13868952, 130537496, 1224977498, 11577801970, 109063132114, 1035175545192, 9789065497830, 93311908294380, 885819798218548, 8480241264665590, 80814542061692066, 776980355789433902 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

FORMULA

Empirical: a(n) = 27*a(n-1) -7*a(n-2) -5642*a(n-3) +38876*a(n-4) +328643*a(n-5) -3991917*a(n-6) -1314423*a(n-7) +134764409*a(n-8) -274870060*a(n-9) -1754310602*a(n-10) +6188057089*a(n-11) +6383741530*a(n-12) -45869779722*a(n-13) +19646271368*a(n-14) +128555834088*a(n-15) -144208395792*a(n-16) -115200081792*a(n-17) +233207698368*a(n-18) -26459811072*a(n-19) -102846620160*a(n-20) +35034937344*a(n-21) +13514784768*a(n-22) -5918883840*a(n-23).

EXAMPLE

Some solutions for n=3:

0 3 4 1 2 1 0 4 3 0 2 3 1 2 3 1 2 1 1 4 1

0 1 4 1 0 1 0 2 3 5 5 4 3 2 5 3 2 3 1 2 1

1 0 5 3 4 3 0 4 3 2 4 5 1 2 3 5 2 1 2 1 2

5 2 5 4 3 4 1 3 0 2 2 5 2 1 4 2 1 2 4 1 4

CROSSREFS

Column 2 of A234497.

Sequence in context: A186899 A185484 A133539 * A100970 A159202 A238294

Adjacent sequences: A234489 A234490 A234491 * A234493 A234494 A234495

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 26 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 February 9 08:37 EST 2023. Contains 360154 sequences. (Running on oeis4.)