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

 

Logo

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!)
A252216 Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 5 6 or 7 1
5011, 6674, 35674, 188866, 984604, 5218112, 27565870, 145417326, 769096658, 4065302226, 21466258470, 113390920642, 599189709130, 3165902491146, 16725123385874, 88359158741876, 466828724130952, 2466405305351084 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A252219

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-2) +43*a(n-3) +222*a(n-4) +482*a(n-5) +681*a(n-6) -1029*a(n-7) -6287*a(n-8) -8465*a(n-9) -1385*a(n-10) +20916*a(n-11) +46692*a(n-12) +15066*a(n-13) -66599*a(n-14) -101537*a(n-15) -23823*a(n-16) +122361*a(n-17) +169438*a(n-18) +64400*a(n-19) -97706*a(n-20) -193601*a(n-21) -163645*a(n-22) -11117*a(n-23) +89565*a(n-24) +111435*a(n-25) +63076*a(n-26) -37544*a(n-27) -1865*a(n-28) -32113*a(n-29) +27664*a(n-30) +17688*a(n-31) -7392*a(n-32) +18202*a(n-33) -26599*a(n-34) +19810*a(n-35) -13865*a(n-36) +11432*a(n-37) -6215*a(n-38) +2983*a(n-39) -2054*a(n-40) +805*a(n-41) -244*a(n-42) +151*a(n-43) -24*a(n-44) -11*a(n-45) +5*a(n-46) for n>48

EXAMPLE

Some solutions for n=4

..1..1..2..1..1..1..1....1..1..1..1..1..1..1....1..1..1..1..2..1..1

..2..1..1..1..1..1..2....2..1..1..1..1..1..1....2..1..1..1..1..1..1

..1..1..1..1..1..1..1....1..1..1..1..1..1..2....1..1..1..2..1..1..1

..1..1..1..1..1..1..1....1..1..1..1..1..1..1....1..1..1..1..1..1..1

..2..1..1..1..1..1..2....1..1..2..1..1..1..1....1..1..1..1..1..1..2

..1..1..2..1..1..2..1....2..1..1..1..1..1..2....1..2..1..1..1..2..1

CROSSREFS

Sequence in context: A209908 A217985 A201178 * A281299 A112139 A188241

Adjacent sequences:  A252213 A252214 A252215 * A252217 A252218 A252219

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 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 November 29 02:45 EST 2020. Contains 338756 sequences. (Running on oeis4.)