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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A260496 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011 1
218, 347, 868, 1756, 2420, 5219, 11450, 17686, 34000, 74901, 127782, 231220, 493414, 902322, 1605968, 3284745, 6257230, 11223229, 22117862, 42933197, 78291428, 150404230, 293145834, 543695449, 1029765114, 1999476726, 3758265476 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A260501

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-3) +9*a(n-4) -19*a(n-6) -48*a(n-7) -33*a(n-8) +24*a(n-9) +72*a(n-10) +116*a(n-11) +46*a(n-12) -54*a(n-13) -93*a(n-14) -128*a(n-15) -58*a(n-16) +32*a(n-17) +29*a(n-18) +74*a(n-19) +66*a(n-20) +8*a(n-21) +12*a(n-22) -20*a(n-23) -38*a(n-24) -8*a(n-25) -4*a(n-26) +2*a(n-27) +8*a(n-28) +2*a(n-29) +a(n-30) for n>33

EXAMPLE

Some solutions for n=4

..0..0..0..1..1....1..0..0..0..1....0..0..0..1..1....1..1..0..0..1

..0..0..0..1..0....1..0..0..1..1....1..0..0..1..0....0..1..0..0..0

..1..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0

..1..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..1

..0..0..0..1..1....0..0..1..0..0....0..0..1..0..0....0..1..0..0..1

..0..0..0..0..1....1..1..0..0..0....1..1..0..0..0....0..1..0..0..0

CROSSREFS

Cf. A260501

Sequence in context: A121379 A171404 A131660 * A038595 A045239 A185462

Adjacent sequences:  A260493 A260494 A260495 * A260497 A260498 A260499

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 27 2015

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 October 18 15:19 EDT 2021. Contains 348068 sequences. (Running on oeis4.)