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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..39.

F.M. van Lamoen, Spiral recurrence.

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

Cf. A062410, A063177.

Sequence in context: A004694 A309527 A023176 * A280205 A276731 A028891

Adjacent sequences:  A063175 A063176 A063177 * A063179 A063180 A063181

KEYWORD

nonn,nice

AUTHOR

Floor van Lamoen, Jul 09 2001

STATUS

approved

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Last modified April 6 21:24 EDT 2020. Contains 333286 sequences. (Running on oeis4.)