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A139018 Number of n X n symmetric binary matrices containing no more than eight 1s in any 3 X 3 sub-block. 1
1, 2, 8, 63, 993, 31272, 1966528, 246968879, 61940593841, 31024191508984, 31032570052707008, 61990776975991833569, 247302484619089362603617, 1970252768237692185884064992, 31347829801520384863039736050304 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

R. H. Hardin, May 31 2008, Table of n, a(n) for n = 0..19

CROSSREFS

Sequence in context: A084279 A153526 A153554 * A110708 A295232 A287229

Adjacent sequences:  A139015 A139016 A139017 * A139019 A139020 A139021

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 31 2008

STATUS

approved

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Last modified January 17 11:29 EST 2022. Contains 350394 sequences. (Running on oeis4.)