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A063178 Hexagonal spiral sequence: sequence is written as a hexagonal spiral around a 'dummy' center, each entry is the sum of the row in the previous direction containing the previous entry. 3

%I

%S 1,1,2,3,5,8,10,23,33,42,98,110,250,286,646,749,1681,1939,2059,6428,

%T 7097,15584,17556,19279,59516,66042,68211,213048,230854,246724,758837,

%U 825525,885790,2716876,2949411,3164398,3234668,12951143,13783096

%N Hexagonal spiral sequence: sequence is written as a hexagonal spiral around a 'dummy' center, each entry is the sum of the row in the previous direction containing the previous entry.

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

%e The spiral starts

%e 749---646---286

%e / \

%e / \

%e 1681 5-----3 250

%e / / \ \

%e / / \ \

%e 1939 8 * 2 110

%e / / / / /

%e / / / / /

%e 2059 10 1-----1 98

%e \ \ /

%e \ \ /

%e 6428 23----33----42

%Y Cf. A062410, A063177.

%K nonn,nice

%O 1,3

%A _Floor van Lamoen_, Jul 09 2001

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Last modified May 28 13:20 EDT 2020. Contains 334683 sequences. (Running on oeis4.)