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A141503 Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 2 ones in any 2 X 2 subblock. 1
1, 2, 3, 35, 85, 5529, 17421, 6468501, 30238457, 64377477751, 410142991045, 5056537169718019, 45365538098494225, 3235038360513128954137, 40254614759516328904462, 16631279103859270471807630795 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 0..28

CROSSREFS

Sequence in context: A042167 A126910 A143887 * A199696 A234423 A165448

Adjacent sequences:  A141500 A141501 A141502 * A141504 A141505 A141506

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 10 2008

STATUS

approved

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Last modified September 26 16:43 EDT 2020. Contains 337374 sequences. (Running on oeis4.)