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URL: https://oeis.org/A069344

⇱ A069344 - OEIS

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A069344
Number of n X n symmetric binary arrays with path of adjacent 1's from upper right corner to lower left corner.
19
1, 3, 19, 246, 6486, 346550, 37410572, 8142026722, 3567024626500, 3142034178023610
OFFSET
1,2
CROSSREFS
Cf. n X m A069325-A069342, n X n non-symmetric A069343.
Sequence in context: A118023 A054590 A261495 * A305562 A356672 A316294
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 16 2002
STATUS
approved