OFFSET
1,2
COMMENTS
Row sums = A134465: (1, 6, 16, 32, 55, 86, ...).
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
First few rows of the triangle:
1;
2, 4;
3, 5, 8;
4, 6, 9, 13;
5, 7, 10, 14, 19;
6, 8, 11, 15, 20, 26;
7, 9, 12, 16, 21, 27, 34;
...
MATHEMATICA
Flatten[Table[RecurrenceTable[{a[1]==i, a[n]==a[n-1]+n}, a, {n, i}], {i, 10}]] (* Harvey P. Dale, Nov 12 2013 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Oct 26 2007
STATUS
approved