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Search: id:A094926
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| A094926 |
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A hexagonal spiral Fibonacci sequence. |
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+0
2
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| 0, 1, 1, 2, 3, 5, 8, 14, 23, 38, 63, 102, 168, 272
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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Consider the following spiral:
..........a(6)..a(7)..a(8)
.......a(5)..a(1)..a(2)..a(9)
....a(14).a(4)..a(3)..a(10)
.......a(13).a(12).a(11)
Then a(1)=0, a(2)=1, a(n)=a(n-1)+Sum{a(i), a(i) is adjacent to a(n-1)}; 6 terms around a(m) touch a(m).
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LINKS
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N. Fernandez, Spiro-Fibonacci numbers
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EXAMPLE
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.........5..8..14
........3..0..1..23
...... 272. 2..1. 38
........ 168.102.63
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CROSSREFS
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Cf. A094925, A078510, A079421, A079422.
Sequence in context: A000046 A131132 A004692 this_sequence A078843 A018068 A120400
Adjacent sequences: A094923 A094924 A094925 this_sequence A094927 A094928 A094929
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KEYWORD
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nonn,easy,more
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AUTHOR
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Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp)
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