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A145792 Number of n X n binary arrays symmetric about main diagonal with all ones connected only either four adjacent vertically or four adjacent horizontally. 0
1, 1, 1, 1, 3, 8, 27, 89, 350, 1943, 13578, 114816, 1134812, 13374912, 197153652, 3619365346, 81478825413, 2227027591689, 73860566227987, 3001388762491543, 149854380038852307, 9172310473214513455, 686434022927867658469 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..23.

CROSSREFS

Sequence in context: A121650 A151462 A145967 * A148834 A148835 A148836

Adjacent sequences:  A145789 A145790 A145791 * A145793 A145794 A145795

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 19 2008

STATUS

approved

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Last modified August 25 13:50 EDT 2019. Contains 326324 sequences. (Running on oeis4.)