A079422 - OEIS

%I #4 Mar 31 2012 14:39:53

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

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

%H N. Fernandez, <a href="http://www.borve.org/primeness/spirofib.html">Graphical representations of some Spiro-Fibonacci sequences</a>

%e 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.

%Y Cf. A063826, A078510, A079421.

%K nonn

%O 1,2

%A _Neil Fernandez_, Jan 07 2003