OFFSET
0,3
COMMENTS
Motivated by the question how a sequence of regular integer triangles can be stored in linear memory (see A332662).
EXAMPLE
a(n) can be seen as the triangle read by rows:
[0] 0;
[1] 1, 2;
[2] 4, 5, 3;
[3] 10, 11, 6, 7;
[4] 20, 21, 12, 13, 8;
[5] 35, 36, 22, 23, 14, 9;
[6] 56, 57, 37, 38, 24, 15, 16;
[7] 84, 85, 58, 59, 39, 25, 26, 17;
...
a(n) can also be seen as the rectangular array read by upwards antidiagonals (with flat rows):
(A) [ 0], [ 2, 3], [ 7, 8, 9], [16, 17, 18, 19], [30, 31, 32, 33, 34],...
(B) [ 1], [ 5, 6], [13, 14, 15], [26, 27, 28, 29], ...
(C) [ 4], [11, 12], [23, 24, 25], ...
(D) [10], [21, 22], ...
(E) [20], ...
...
MAPLE
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Peter Luschny, Feb 19 2020
STATUS
approved