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A140649 Triangle whose rows are decreasing powers of 2, followed by 0. 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 (list; graph; refs; listen; history; text; internal format)
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: A261877 A062296 A249343 * A290222 A327549 A293808

Adjacent sequences:  A140646 A140647 A140648 * A140650 A140651 A140652

KEYWORD

nonn,easy,tabf

AUTHOR

Paul Curtz, Jul 09 2008

STATUS

approved

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Last modified April 7 15:56 EDT 2020. Contains 333306 sequences. (Running on oeis4.)