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, 139, 155, 160, 168, 182, 217, 229, 249, 259, 279, 293, 303, 312, 342, 399, 454, 493, 530, 566, 603, 642, 681, 722, 765, 817, 875, 909, 958, 992, 1044, 1107, 1160, 1215, 1267, 1315

Offset: 1

Author

Neil Fernandez, Jan 07 2003

Keywords

• nonn

Examples

			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.
		

Links

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

Crossrefs

Cf. A063826, A078510, A079421.

Extensions

More terms from Sean A. Irvine, Aug 13 2025