login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A232511 Number of (n+1)X(4+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally, diagonally or antidiagonally, with no adjacent elements equal 1
54, 326, 2516, 19138, 145682, 1110752, 8470018, 64594290, 492627324, 3757052022, 28653492802, 218528696816, 1666631440922, 12710736921242, 96939753662116, 739321100203858, 5638509196177426, 43002676390969828, 327964380966543498 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A232515

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +a(n-2) -23*a(n-3) -48*a(n-4) -9*a(n-5) +40*a(n-6) +44*a(n-7) +5*a(n-8) -20*a(n-9) +3*a(n-10) +9*a(n-11) +6*a(n-12) -a(n-13) -2*a(n-14)

EXAMPLE

Some solutions for n=5

..2..1..0..1..0....2..1..0..1..2....0..1..2..1..0....0..1..0..1..0

..0..1..2..1..0....0..1..0..1..0....2..1..2..1..2....0..1..2..1..0

..2..1..2..1..0....0..1..0..1..2....0..1..2..1..0....0..1..2..1..2

..2..1..0..1..0....0..1..2..1..0....0..1..2..1..0....2..1..2..1..2

..2..1..0..1..0....2..1..0..1..2....2..1..2..1..0....0..1..0..1..0

..0..1..0..1..2....0..1..0..1..2....0..1..0..1..0....0..1..2..1..0

CROSSREFS

Sequence in context: A245830 A102838 A090832 * A262853 A230921 A239687

Adjacent sequences:  A232508 A232509 A232510 * A232512 A232513 A232514

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 25 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 December 8 05:26 EST 2021. Contains 349590 sequences. (Running on oeis4.)