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A145774 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only either two adjacent vertically or two adjacent horizontally. 0
1, 3, 5, 18, 124, 889, 9624, 117592, 3086899, 71342470, 3940302454, 162484045629, 19765145478158, 1482360209667114, 393627814809408705, 53489489176352337875, 30927278141339388397696, 7617052120730650394236371 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..18.

CROSSREFS

Sequence in context: A303684 A022489 A176749 * A270894 A272317 A128362

Adjacent sequences:  A145771 A145772 A145773 * A145775 A145776 A145777

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 18 2008

STATUS

approved

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Last modified October 27 22:24 EDT 2021. Contains 348305 sequences. (Running on oeis4.)