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

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Cf. n X m A069325-A069342, n X n non-symmetric A069343.

Sequence in context: A118023 A054590 A261495 * A305562 A356672 A316294

Adjacent sequences: A069341 A069342 A069343 * A069345 A069346 A069347

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 16 2002

STATUS

approved