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A062410
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.
3
1, 1, 2, 3, 4, 9, 11, 24, 28, 31, 94, 105, 114, 344, 375, 403, 427, 1663, 1777, 1882, 1976, 7725, 8152, 8555, 8930, 9274, 44612, 46588, 48470, 50247, 51910, 251101, 260375, 269305, 277860, 286012, 293737, 1690300, 1742210, 1792457, 1840927
OFFSET
1,3
EXAMPLE
The initial part of the square spiral sequence is
.
344-114
|
4---3---2 105
| | |
9 1---1 94
| |
11--24--28--31
CROSSREFS
Sequence in context: A217493 A368349 A125774 * A145772 A027866 A283596
KEYWORD
nonn
AUTHOR
Floor van Lamoen, Jul 09 2001
STATUS
approved