login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A252365 Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 4 6 or 7 1
658, 2338, 10450, 45516, 192946, 818040, 3482672, 14848406, 63260032, 269276490, 1146479186, 4882764600, 20793914762, 88545635100, 377056380768, 1605668962346, 6837603120792, 29117161531894, 123992231041454 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A252369

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +6*a(n-2) +20*a(n-3) +54*a(n-4) +38*a(n-5) -41*a(n-6) -191*a(n-7) -285*a(n-8) +296*a(n-9) +753*a(n-10) -160*a(n-11) -791*a(n-12) -99*a(n-13) +334*a(n-14) +98*a(n-15) -18*a(n-16) +54*a(n-17) -3*a(n-18) -35*a(n-19) +3*a(n-20) -12*a(n-21) -7*a(n-22) +4*a(n-23) for n>25

EXAMPLE

Some solutions for n=4

..2..0..0..2..0..0....2..0..0..0..2..0....0..0..0..0..0..2....0..0..0..2..0..0

..0..0..0..0..0..0....0..0..2..0..0..0....0..0..2..0..0..0....0..0..0..0..0..2

..0..0..0..0..0..0....0..0..0..0..0..2....0..0..0..0..0..0....0..0..0..0..0..0

..0..0..2..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..2..0..0..0

..2..0..0..0..0..0....0..2..0..0..0..0....0..0..0..0..0..2....2..0..0..0..2..0

..0..2..0..0..0..0....0..0..0..0..2..0....0..0..0..0..2..0....0..0..0..0..0..0

CROSSREFS

Sequence in context: A034818 A210091 A068260 * A198207 A171393 A349586

Adjacent sequences:  A252362 A252363 A252364 * A252366 A252367 A252368

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

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 January 26 07:34 EST 2022. Contains 350577 sequences. (Running on oeis4.)