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!)
A260977 Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101 1
1146, 925, 1288, 2714, 4592, 9144, 14672, 29768, 50432, 101372, 171124, 340878, 582500, 1157798, 1990592, 3921926, 6784120, 13315792, 23162244, 45162484, 78973048, 153447472, 269491716, 520685028, 918595544, 1769858760, 3133573780 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A260980

LINKS

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

FORMULA

Empirical: a(n) = 12*a(n-4) +4*a(n-5) +4*a(n-7) -15*a(n-8) -32*a(n-9) -3*a(n-10) -34*a(n-11) +a(n-12) +16*a(n-13) +8*a(n-14) +28*a(n-15) -51*a(n-16) +40*a(n-17) +16*a(n-18) -36*a(n-19) +33*a(n-20) +224*a(n-21) -4*a(n-23) +64*a(n-24) +128*a(n-25) -24*a(n-27) +64*a(n-28) for n>34

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260980

Sequence in context: A237458 A202312 A123697 * A227478 A190924 A196779

Adjacent sequences:  A260974 A260975 A260976 * A260978 A260979 A260980

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 06 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 September 19 15:37 EDT 2021. Contains 347564 sequences. (Running on oeis4.)