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!)
A257358 Number of (n+2)X(5+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
45684, 53824, 112236, 246016, 482560, 1196836, 2980712, 6240004, 12771684, 30294016, 73190688, 157101156, 333866808, 779191396, 1825996900, 3991206976, 8669972808, 19918805956, 45934641144, 101485570624, 223394526672 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A257361

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-3) +16*a(n-4) +8*a(n-5) +4*a(n-6) +2*a(n-7) +18*a(n-8) +6*a(n-9) -4*a(n-10) -18*a(n-11) -141*a(n-12) -60*a(n-13) +48*a(n-14) +18*a(n-15) -117*a(n-16) -66*a(n-17) +48*a(n-19) +279*a(n-20) +108*a(n-21) -12*a(n-22) -12*a(n-23) +15*a(n-24) +36*a(n-25) +16*a(n-26) -6*a(n-27) -36*a(n-28) -8*a(n-29) -4*a(n-30) -2*a(n-31) -a(n-32) -2*a(n-33) +a(n-36) for n>41

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Cf. A257361

Sequence in context: A184473 A157653 A202915 * A232255 A031841 A031635

Adjacent sequences:  A257355 A257356 A257357 * A257359 A257360 A257361

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 21 05:28 EDT 2021. Contains 348141 sequences. (Running on oeis4.)