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Search: id:A067963
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| A067963 |
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Number of binary arrangements without adjacent 1's on n X n array connected e-w ne-sw nw-se. |
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+0
9
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| 2, 7, 77, 1152, 56549, 3837761, 806190208, 251170142257, 223733272186825, 319544298135448960, 1210302996752248488817, 7876274672755293629849313, 127662922218147601317696761088, 3758866349549535184419575245899295
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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Neighbors for n=4 (dots represent spaces):
. o--o--o--o
...\/ \/ \/
.../\ /\ /\
. o--o--o--o
...\/ \/ \/
.../\ /\ /\
. o--o--o--o
...\/ \/ \/
.../\ /\ /\
. o--o--o--o
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CROSSREFS
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Cf. circle A000204, line A000045, arrays: ne-sw nw-se A067965, n-s nw-se A067964, e-w n-s nw-se A066864, e-w ne-sw n-s nw-se A063443, n-s A067966, e-w n-s A006506, nw-se A067962, toruses: bare A002416, ne-sw nw-se A067960, ne-sw n-s nw-se A067959, e-w ne-sw n-s nw-se A067958, n-s A067961, e-w n-s A027683, e-w ne-sw n-s A066866.
Adjacent sequences: A067960 A067961 A067962 this_sequence A067964 A067965 A067966
Sequence in context: A064646 A083455 A083829 this_sequence A059406 A042791 A128293
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhh(AT)cadence.com), Feb 02 2002
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