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A145760 Number of n X n binary arrays symmetric about main diagonal with all ones connected only either three adjacent vertically or three adjacent horizontally. 0
1, 1, 1, 3, 8, 27, 96, 569, 4093, 37611, 421080, 6366190, 123605120, 3088656877, 98116765714, 4039581343182, 214357411746908, 14651947137883915, 1285925403332066988, 145385760960996273023, 21168918836708595100735 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..21.

CROSSREFS

Sequence in context: A148843 A319787 A148844 * A102318 A102206 A192856

Adjacent sequences:  A145757 A145758 A145759 * A145761 A145762 A145763

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 17 2008

STATUS

approved

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Last modified October 14 05:08 EDT 2019. Contains 327995 sequences. (Running on oeis4.)