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Search: id:A094769
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| A094769 |
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A spiral Fibonacci sequence. |
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+0
3
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| 0, 1, 1, 2, 4, 6, 12, 18, 37, 56, 94, 189
(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(7) a(8) a(9) a(10)
.a(6) a(1) a(2) a(11)
.a(5) a(4) a(3) a(12)
.a(16)a(15)a(14)a(13)
Then a(1)=0, a(1) = 1, a(n)=a(n-1)+Sum{a(i) : a(i) is adjacent to a(n-1)}. Here 8 terms around a(m) touch a(m).
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CROSSREFS
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Cf. A094767, A094768.
Sequence in context: A104352 A133488 A068911 this_sequence A068018 A060798 A134320
Adjacent sequences: A094766 A094767 A094768 this_sequence A094770 A094771 A094772
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KEYWORD
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nonn
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AUTHOR
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Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp), Jun 10 2004
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