OFFSET
1,2
COMMENTS
The terms are from numeric computation - no formula for a(n) is currently known.
LINKS
Scott R. Shannon, Image for n = 2 showing the count of the vertices.
Scott R. Shannon, Image for n = 3 showing the count of the vertices.
Scott R. Shannon, Image for n = 5 showing the count of the vertices.
Scott R. Shannon, Image for n = 9 showing the count of the vertices.
Scott R. Shannon, Image for n = 12 showing the count of the vertices.
EXAMPLE
Triangle begins:
1;
3, 3;
5, 11, 5;
7, 19, 19, 7;
9, 29, 43, 29, 9;
11, 37, 61, 61, 37, 11;
13, 47, 83, 105, 83, 47, 13;
15, 57, 103, 143, 143, 103, 57, 15;
17, 69, 125, 183, 211, 183, 125, 69, 17;
19, 81, 143, 215, 267, 267, 215, 143, 81, 19;
21, 95, 167, 253, 329, 369, 329, 253, 167, 95, 21;
23, 109, 189, 289, 385, 455, 455, 385, 289, 189, 109, 23;
25, 125, 215, 331, 451, 551, 597, 551, 451, 331, 215, 125, 25;
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Scott R. Shannon and N. J. A. Sloane, May 21 2020
STATUS
approved