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!)
A257359 Number of (n+2)X(6+2) 0..1 arrays with no 3x3 subblock diagonal sum equal to the antidiagonal sum or central row sum less than the central column sum 1
174724, 145924, 234256, 622521, 1196836, 2433600, 6012304, 15547249, 31606884, 64818601, 152028900, 378341401, 795240000, 1701645001, 3917508100, 9407060100, 20173089024, 44278259776, 100259623044, 236166840900, 512492764996 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A257361

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-2) +17*a(n-4) -57*a(n-6) +2*a(n-8) -60*a(n-10) -127*a(n-12) +598*a(n-14) -292*a(n-16) +315*a(n-18) +312*a(n-20) -1149*a(n-22) +223*a(n-26) -55*a(n-28) +127*a(n-30) +51*a(n-32) -32*a(n-34) -6*a(n-36) -5*a(n-38) -a(n-40) +a(n-42) for n>48

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Cf. A257361

Sequence in context: A247348 A029830 A202491 * A126557 A342325 A236116

Adjacent sequences:  A257356 A257357 A257358 * A257360 A257361 A257362

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 20 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 22 01:48 EDT 2021. Contains 348160 sequences. (Running on oeis4.)