A079422 a(n) = number of 1's in the first n^2 Spiro-Fibonacci differences.

0, 3, 7, 11, 15, 19, 24, 26, 32, 41, 49, 55, 61, 67, 75, 78, 83, 111, 119, 135

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: A039957 A217332 A369056 * A310210 A292657 A277675

Adjacent sequences: A079419 A079420 A079421 * A079423 A079424 A079425

Keyword

nonn

Author

Neil Fernandez, Jan 07 2003

Status

approved