OFFSET
0,4
COMMENTS
Row sums = A005449: (0, 2, 7, 15, 26, 40, 57, ...).
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..1000
EXAMPLE
First few rows of the triangle:
0;
1, 1;
2, 2, 3;
3, 3, 4, 5;
4, 4, 5, 6, 7;
5, 5, 6, 7, 8, 9;
6, 6, 7, 8, 9, 10, 11;
7, 7, 8, 9, 10, 11, 12, 13;
...
MATHEMATICA
Table[{n, n+Range[0, n-1]}, {n, 0, 20}]//Flatten (* Harvey P. Dale, Dec 26 2020 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Oct 23 2007
EXTENSIONS
Leading term changed from 1 to 0 by N. J. A. Sloane, Apr 06 2008
Corrected and extended by Harvey P. Dale, Dec 26 2020
STATUS
approved