login
A181105
Triangle T(n,k) read by rows. T(n,k)=abs(A181101)*n/k.
0
1, 2, 0, 3, 0, 0, 0, 2, 0, 0, 5, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0
OFFSET
1,2
COMMENTS
Let A=T(n,k)*T(n,k), B=A*A, C=B*B, D=C*C, and so on. Then the first column in the last matrix (D) converges to the natural numbers. Rows sums are (unsurprisingly) A020639. Except for the first column, the largest and last element in the columns are also A020639.
EXAMPLE
Triangle starts:
1,
2,0,
3,0,0,
0,2,0,0,
5,0,0,0,0,
0,0,2,0,0,0,
7,0,0,0,0,0,0,
0,0,0,2,0,0,0,0,
0,0,3,0,0,0,0,0,0,
0,0,0,0,2,0,0,0,0,0,
11,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,2,0,0,0,0,0,0,
13,0,0,0,0,0,0,0,0,0,0,0,0,
CROSSREFS
Sequence in context: A255308 A079302 A138806 * A142971 A104117 A114511
KEYWORD
nonn,tabl
AUTHOR
Mats Granvik, Gary W. Adamson, Oct 03 2010
STATUS
approved