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A141509 Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 3 ones in any 2 X 2 subblock. 1
1, 2, 3, 57, 128, 22077, 65205, 114142368, 468343535, 7969215344753, 44467930404864, 7479088292930771309, 57134805472751200753, 94492733598842569249024512, 986251920362343910672065291 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A179281 A000656 A116052 * A054313 A080052 A157190
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 10 2008
STATUS
approved

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Last modified April 21 19:32 EDT 2024. Contains 371885 sequences. (Running on oeis4.)