The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A159367 Number of n X n arrays of squares of integers summing to 7 1
 4, 540, 18720, 531300, 8583300, 86748088, 623757696, 3483871560, 16023245700, 63174296020, 219752181792, 688950636972, 1978607887620, 5271705817200, 13162584962560, 31050835145616, 69671782148868, 149524133455500 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS All such sequences have holonomic recurrences (cf. comment in A159359). - Georg Fischer, Feb 17 2022 LINKS R. H. Hardin, Table of n, a(n) for n=2..100 Index entries for linear recurrences with constant coefficients, signature (15, -105, 455, -1365, 3003, -5005, 6435, -6435, 5005, -3003, 1365, -455, 105, -15, 1). FORMULA Empirical: a(n)=n^2*(n-1)*(n+1)*(n^2-2)*(n^2-3)*(n^6-15*n^4+74*n^2+720)/5040. [From R. J. Mathar, Aug 11 2009] CROSSREFS Sequence in context: A152463 A295206 A209608 * A012770 A332154 A202032 Adjacent sequences: A159364 A159365 A159366 * A159368 A159369 A159370 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 22 04:48 EDT 2024. Contains 373565 sequences. (Running on oeis4.)