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!)
A258528 Number of (n+2)X(6+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the central row and central column plus the two minimums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
1302500, 16010949, 106485657, 112691334, 288227428, 592438330, 1541134768, 5755957944, 16756864216, 56699546024, 199945154888, 715151389512, 2526239531720, 9750287865160, 35521705708488, 140976354999880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A258530

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +19*a(n-2) -78*a(n-3) -56*a(n-4) +224*a(n-5) +304*a(n-6) -1824*a(n-7) -1152*a(n-8) +36864*a(n-9) -19968*a(n-10) -157696*a(n-11) -151552*a(n-12) +688128*a(n-13) +655360*a(n-14) -2097152*a(n-15) +1048576*a(n-16) for n>26

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Cf. A258530

Sequence in context: A262531 A250830 A258535 * A254920 A002806 A216076

Adjacent sequences:  A258525 A258526 A258527 * A258529 A258530 A258531

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 02 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 19 03:10 EDT 2021. Contains 348073 sequences. (Running on oeis4.)