This site is supported by donations to The OEIS Foundation.

The OEIS is looking to hire part-time people to help edit core sequences, upload scanned documents, process citations, fix broken links, etc. - Neil Sloane, njasloane@gmail.com

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A146197 Number of n X n arrays of squares of integers summing to 6 with every element equal to at least one neighbor. 1
 0, 18, 1070, 8266, 33102, 97050, 236458, 508330, 997046, 1822042, 3146450, 5186698, 8223070, 12611226, 18794682, 27318250, 38842438, 54158810, 74206306, 100088522, 133091950, 174705178, 226639050, 290847786 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 LINKS FORMULA Empirical (for n>=5): a(n) = 4*n^6/3 - 4*n^5 + 14*n^4 - 178*n^3/3 - 886*n^2/3 + 3958*n/3 - 614. - Vaclav Kotesovec, Nov 30 2012 CROSSREFS Sequence in context: A214181 A275653 A214232 * A159379 A052135 A033518 Adjacent sequences:  A146194 A146195 A146196 * A146198 A146199 A146200 KEYWORD nonn AUTHOR R. H. Hardin Apr 14 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.