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A156426 Number of 18 X 18 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n. 0
1, 168992, 2037627900, 3518648357632, 1392671800456580, 166774503916789696, 7527949573364777296 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..6.

CROSSREFS

Sequence in context: A140941 A186550 A151618 * A156427 A185474 A034211

Adjacent sequences:  A156423 A156424 A156425 * A156427 A156428 A156429

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 09 2009

STATUS

approved

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Last modified December 4 09:25 EST 2020. Contains 338921 sequences. (Running on oeis4.)