The On-Line Encyclopedia of Integer Sequences (OEIS)

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A156471

Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 19.
(history; published version)

#4 by Charles R Greathouse IV at Fri Dec 18 18:17:17 EST 2015

NAME

Number of nXn n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 19.

Discussion

Fri Dec 18

18:17

OEIS Server: https://oeis.org/edit/global/2478

#3 by Russ Cox at Sat Mar 31 12:35:25 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Feb 09 2009

Discussion

Sat Mar 31

12:35

OEIS Server: https://oeis.org/edit/global/875

#2 by N. J. A. Sloane at Sat Oct 02 03:00:00 EDT 2010

KEYWORD

nonn,new

nonn

AUTHOR

Ron R. H. Hardin (rhhardin(AT)att.net) Feb 09 2009

#1 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

NAME

Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 19.

DATA

2, 28, 76, 6024, 39000, 4562152, 61580624, 13526490400, 338077231956, 183471645987760

OFFSET

3,1

KEYWORD

nonn,new

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Feb 09 2009

STATUS

approved