A140649 Triangle whose rows are decreasing powers of 2, followed by 0.

1, 0, 2, 1, 0, 4, 2, 1, 0, 8, 4, 2, 1, 0, 16, 8, 4, 2, 1, 0, 32, 16, 8, 4, 2, 1, 0, 64, 32, 16, 8, 4, 2, 1, 0, 128, 64, 32, 16, 8, 4, 2, 1, 0, 256, 128, 64, 32, 16, 8, 4, 2, 1, 0, 512, 256, 128, 64, 32, 16, 8, 4, 2, 1, 0, 1024, 512, 256, 128, 64, 32, 16, 8, 4, 2, 1, 0, 2048, 1024, 512, 256, 128, 64, 32, 16, 8, 4, 2, 1, 0, 4096

Offset

2,3

Links

Table of n, a(n) for n=2..92.

Formula

T(n,k) = 2^(n-k-1) if n>k, otherwise 0.

Example

Triangle begins
1, 0,
2, 1, 0,
4, 2, 1, 0,
8, 4, 2, 1, 0,
16, 8, 4, 2, 1, 0,
32, 16, 8, 4, 2, 1, 0,
64, 32, 16, 8, 4, 2, 1, 0

Prog

(PARI) T(n, k) = if(n>k, 2^(n-k-1), 0);
for(n=2, 10, for(k=1, n, print1(T(n, k), ", ")); print()); /* show triangle */

Crossrefs

Sequence in context: A249343 A369206 A355756 * A290222 A327549 A293808

Adjacent sequences: A140646 A140647 A140648 * A140650 A140651 A140652

Keyword

nonn,easy,tabf

Author

Paul Curtz, Jul 09 2008

Status

approved