OFFSET
1,2
COMMENTS
We can find the spiral on the terraces of the stepped pyramid described in A244050. - Omar E. Pol, Dec 07 2016
EXAMPLE
If written as an irregular triangle in which row lengths is A237271 the sequence begins:
1;
4;
6, 8;
15;
18, 21;
33;
37, 41;
56;
61, 64, 69;
78, 87;
93, 99;
127;
134, 141;
153, 165;
173, 181, 189;
220;
229, 238;
277;
287, 297;
339;
350, 355, 360, 371;
389, 407;
419, 431;
491;
504, 509, 522;
...
Right border gives A024916.
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Mar 31 2014
STATUS
approved