The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A252573 Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7 1

%I

%S 9936,47737,208375,959944,6590930,31059674,155864925,994640586,

%T 4728064653,24277561799,152128655769,724041200896,3737920882959,

%U 23334351446462,111056940261198,574039942229995,3581491498190689

%N Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7

%C Column 7 of A252574

%H R. H. Hardin, <a href="/A252573/b252573.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=2

%e ..2..3..2..2..3..1..2..3..1....2..3..2..2..3..2..2..3..2

%e ..0..0..1..0..0..2..0..0..2....0..0..2..0..0..1..0..0..2

%e ..2..0..0..2..0..0..2..0..0....2..0..0..2..0..0..2..0..0

%e ..2..3..2..2..3..1..2..3..2....2..3..2..2..3..2..2..3..1

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 18 2014

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.

Last modified December 3 14:12 EST 2020. Contains 338906 sequences. (Running on oeis4.)