OFFSET
0,3
COMMENTS
LINKS
Lars Blomberg, Table of n, a(n) for n = 0..3384
EXAMPLE
The central portion of the spiral is:
.
7----4----2
| |
13 1----1 239
| |
23---42---76--146
.
After the terms a(0) to a(8) of the spiral have been filled in, the next cell contains 76+42+23+1+4 = 146 = a(9).
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Dec 24 2016
EXTENSIONS
More terms from Lars Blomberg, Dec 25 2016
STATUS
approved