A062410 - OEIS

%I #10 Aug 13 2018 09:02:48

%S 1,1,2,3,4,9,11,24,28,31,94,105,114,344,375,403,427,1663,1777,1882,

%T 1976,7725,8152,8555,8930,9274,44612,46588,48470,50247,51910,251101,

%U 260375,269305,277860,286012,293737,1690300,1742210,1792457,1840927

%N Square spiral sequence: numbers are placed in a square spiral, a(1)=1, a(n) is found as the sum of the row (in the previous direction) a(n-1) is in.

%H F. M. van Lamoen, <a href="http://home.wxs.nl/~lamoen/wiskunde/spiral.htm">Spiral recurrence</a>.

%e The initial part of the square spiral sequence is

%e .

%e          344-114

%e                |

%e    4---3---2 105

%e    |       |   |

%e    9   1---1  94

%e    |           |

%e   11--24--28--31

%Y Cf. A063177, A063178.

%K nonn

%O 1,3

%A _Floor van Lamoen_, Jul 09 2001