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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
1, 1, 2, 3, 5, 8, 10, 23, 33, 42, 98, 110, 250, 286, 646, 749, 1681, 1939, 2059, 6428, 7097, 15584, 17556, 19279, 59516, 66042, 68211, 213048, 230854, 246724, 758837, 825525, 885790, 2716876, 2949411, 3164398, 3234668, 12951143, 13783096
OFFSET
1,3
EXAMPLE
The spiral starts
749---646---286
/ \
/ \
1681 5-----3 250
/ / \ \
/ / \ \
1939 8 * 2 110
/ / / / /
/ / / / /
2059 10 1-----1 98
\ \ /
\ \ /
6428 23----33----42
CROSSREFS
Sequence in context: A004694 A309527 A023176 * A280205 A276731 A028891
KEYWORD
nonn,nice
AUTHOR
Floor van Lamoen, Jul 09 2001
STATUS
approved