OFFSET
1,2
COMMENTS
Row sums = n^2.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
FORMULA
Triangle read by rows, T(n) followed by 1,2,3,...,n-1. Row differences of triangle A130269 starting from the left.
EXAMPLE
First few rows of the triangle:
1;
3, 1;
6, 1, 2;
10, 1, 2, 3;
15, 1, 2, 3, 4;
...
Row 4 = (10, 1, 2, 3) = differences of row 4 of A130269: (10, 11, 13, 16).
MATHEMATICA
Table[Join[{(n(n+1))/2, Range[n-1]}], {n, 10}]//Flatten (* Harvey P. Dale, Dec 31 2021 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, May 18 2007
STATUS
approved