OFFSET
1,2
COMMENTS
Row sums = A134869: (1, 4, 7, 11, 16, 22, 29, ...).
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
FORMULA
EXAMPLE
First few rows of the triangle:
1;
2, 2;
2, 2, 3;
2, 2, 3, 4;
2, 2, 3, 4, 5;
...
MATHEMATICA
Table[k + Boole[k == 1 && n != 2], {n, 2, 14}, {k, n - 1}] // Flatten (* Michael De Vlieger, Jul 19 2016 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Nov 14 2007
STATUS
approved