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!)
A159361 Number of n X n arrays of squares of integers with every (n-2)X(n-2) subblock summing to 5 1
68, 3974, 489344, 11519386, 120219092, 783628988, 3750168768, 14410898388, 46984276484, 134788006082, 348991646336, 830716777310, 1843200453460, 3853005291320, 7651988628800, 14534976588312, 26551869394500 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

LINKS

R. H. Hardin, Table of n, a(n) for n=4..25

FORMULA

Empirical G.f.: -80*x^3 - 2*x^3*(40 - 406*x + 3813*x^2 + 218085*x^3 + 3185176*x^4 + 9874768*x^5 + 7680205*x^6 + 626909*x^7 - 183350*x^8 + 4896*x^9 + 288*x^10)/(-1+x)^11. - Vaclav Kotesovec, Nov 30 2012

CROSSREFS

Sequence in context: A281556 A093268 A231250 * A004298 A223226 A252977

Adjacent sequences:  A159358 A159359 A159360 * A159362 A159363 A159364

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 11 2009

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 February 25 08:21 EST 2020. Contains 332221 sequences. (Running on oeis4.)