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A145795 Number of n X n binary arrays symmetric under 90-degree rotation with all ones connected only either four adjacent vertically or four adjacent horizontally. 0
1, 1, 1, 1, 1, 4, 7, 15, 34, 91, 268, 848, 2982, 11440, 47890, 231566, 1214519, 7161065, 45785181, 328548555, 2571260385, 22573158713, 216461088819, 2326997861375, 27251383779874, 358326282799095 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..26.

CROSSREFS

Sequence in context: A201498 A145970 A232048 * A173657 A213358 A065935

Adjacent sequences:  A145792 A145793 A145794 * A145796 A145797 A145798

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 19 2008

STATUS

approved

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Last modified October 16 13:51 EDT 2019. Contains 328093 sequences. (Running on oeis4.)