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A128138
1
1, 0, 2, 0, 1, 3, 0, 1, 2, 4, 0, 1, 2, 3, 5, 0, 1, 2, 3, 4, 6, 0, 1, 2, 3, 4, 5, 7, 0, 1, 2, 3, 4, 5, 6, 8, 0, 1, 2, 3, 4, 5, 6, 7, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 0, 1, 2, 3
OFFSET
1,3
FORMULA
A000012 * A128132 as infinite lower triangular matrices.
T(n,n) = n.
T(n,k) = k-1, 0<k<n.
EXAMPLE
First few rows of the triangle are:
1;
0, 2;
0, 1, 3;
0, 1, 2, 4;
0, 1, 2, 3, 5;
0, 1, 2, 3, 4, 6;
0, 1, 2, 3, 4, 5, 7;
...
MATHEMATICA
Table[Delete[Range[0, n], -2], {n, 14}] // Flatten (* or *)
Table[If[k == n - 1, k + 1, k], {n, 14}, {k, 0, n - 1}] (* Michael De Vlieger, Apr 26 2016 *)
CROSSREFS
Cf. A000012, A128132, A000124 (row sums).
Sequence in context: A309013 A112760 A096087 * A308999 A208343 A029324
KEYWORD
nonn,tabl,easy
AUTHOR
Gary W. Adamson, Feb 16 2007
STATUS
approved