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A079422 a(n) = number of 1's in the first n^2 Spiro-Fibonacci differences. 2
0, 3, 7, 11, 15, 19, 24, 26, 32, 41, 49, 55, 61, 67, 75, 78, 83, 111, 119, 135 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

N. Fernandez, Graphical representations of some Spiro-Fibonacci sequences

EXAMPLE

The Spiro-Fibonacci differences are 0,1,1,1,1,1,1,1,0,1,0,1,0,1,0,1,...(A079421). Terms are written in square boxes radiating spirally. a(n) = the sum of the first n^2 terms in A079421, i.e. the number of 1's in a spiral of height n and width n.

CROSSREFS

Cf. A063826, A078510, A079421.

Sequence in context: A194397 A039957 A217332 * A310210 A292657 A277675

Adjacent sequences:  A079419 A079420 A079421 * A079423 A079424 A079425

KEYWORD

nonn

AUTHOR

Neil Fernandez, Jan 07 2003

STATUS

approved

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Last modified May 21 02:57 EDT 2019. Contains 323434 sequences. (Running on oeis4.)