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A063177 Triangular spiral sequence: sequence is written as a triangular spiral, each entry is the sum of the row in the previous direction containing the previous entry. 3
1, 1, 2, 2, 5, 6, 6, 19, 22, 23, 23, 93, 101, 108, 110, 110, 545, 573, 601, 626, 632, 632, 3719, 3848, 3978, 4102, 4218, 4241, 4241, 28979, 29704, 30431, 31140, 31823, 32478, 32588, 32588, 253972, 258758, 263549, 268252, 272856, 277336, 281687 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..44.

F.M. van Lamoen, Spiral recurrence.

EXAMPLE

The spiral starts

                       110

                       / \

                      /   \

                    545   110

                    /       \

                   /         \

                 573    2    108

                 /     / \     \

                /     /   \     \

              601    5     2    101

              /     /       \     \

             /     /         \     \

           626    6     1-----1    93

           /     /                   \

          /     /                     \

        632    6----19----22----23----23

CROSSREFS

Cf. A062410, A063178.

Sequence in context: A209465 A209527 A054255 * A249521 A034803 A205885

Adjacent sequences:  A063174 A063175 A063176 * A063178 A063179 A063180

KEYWORD

nonn,nice,changed

AUTHOR

Floor van Lamoen, Jul 09 2001

STATUS

approved

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Last modified August 23 19:47 EDT 2017. Contains 291021 sequences.