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A134868
2
1, 2, 2, 2, 2, 3, 2, 2, 3, 4, 2, 2, 3, 4, 5, 2, 2, 3, 4, 5, 6, 2, 2, 3, 4, 5, 6, 7, 2, 2, 3, 4, 5, 6, 7, 8, 2, 2, 3, 4, 5, 6, 7, 8, 9, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
OFFSET
1,2
COMMENTS
Row sums = A134869: (1, 4, 7, 11, 16, 22, 29, ...).
LINKS
FORMULA
A103451 * A002260 as infinite lower triangular matrices.
Left border of A002260, (1, 1, 1, 1, ...) is replaced by (1, 2, 2, 2, ...).
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