A145776 - OEIS

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A145776

Number of n X n binary arrays symmetric about main diagonal with all ones connected only either two adjacent vertically or two adjacent horizontally.

0

1, 1, 3, 8, 30, 185, 1496, 16722, 271203, 6203100, 197367854, 8915141875, 569403889486, 51067273219036, 6465618290035839, 1155799498602804735, 291067895373206126374, 103368821914100007066399

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OFFSET

1,3

LINKS

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

CROSSREFS

Sequence in context: A274934 A066304 A298456 * A066165 A323775 A360605

Adjacent sequences: A145773 A145774 A145775 * A145777 A145778 A145779

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 18 2008

STATUS

approved