OFFSET
1,2
COMMENTS
Row sums = A134238: (1, 5, 14, 28, 47, 71, 100, 134, ...).
EXAMPLE
First few rows of the triangle:
1;
3, 2;
5, 6, 3;
7, 8, 9, 4;
9, 10, 11, 12, 5;
11, 12, 13, 14, 15, 6;
13, 14, 15, 16, 17, 18, 7;
...
PROG
(PARI) T(n, k) = if (k < n, (2*n-1) + (k-1), n);
tabl(nn) = for (n=1, nn, for (k=1, n, print1(T(n, k), ", ")); print); \\ Michel Marcus, Jul 13 2017
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Oct 14 2007
EXTENSIONS
Corrected and extended by Michel Marcus, Jul 13 2017
STATUS
approved