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A129688
2
1, 0, 1, 2, 0, 1, 0, 2, 0, 1, 2, 0, 2, 0, 1, 0, 2, 0, 2, 0, 1, 2, 0, 2, 0, 2, 0, 1, 0, 2, 0, 2, 0, 2, 0, 1, 2, 0, 2, 0, 2, 0, 2, 0, 1, 0, 2, 0, 2, 0, 2, 0, 2, 0, 1
OFFSET
1,4
COMMENTS
Resulting triangle has (1, 0, 2, 0, 2, 0, 2, ...) in every column.
Row sums = A109613: (1, 1, 3, 3, 5, 5, ...).
FORMULA
A129686 * A128174 as infinite lower triangular matrices.
EXAMPLE
First few rows of the triangle:
1;
0, 1;
2, 0, 1;
0, 2, 0, 1;
2, 0, 2, 0, 1;
...
MATHEMATICA
T[n_, k_] := If[k == n, 1, If[EvenQ[n + k], 2, 0]];
Table[T[n, k], {n, 1, 10}, {k, 1, n}] // Flatten (* Jean-François Alcover, Jul 10 2019 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Apr 28 2007
STATUS
approved