|
Search: id:A161426
|
|
|
| A161426 |
|
Y-toothpick sequence starting at the outside corner of an infinite triangle-shaped polygon as the sieve of A160120 after 2^k rounds. |
|
+0
3
|
|
| 0, 1, 4, 7, 14, 19, 26, 35, 52, 63, 70
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
COMMENT
|
The sequence gives the number of Y-toothpicks after n rounds. A161427 (the first differences) gives the number added at the n-th round.
See the entries A160120, A139250 and A153006 for more information.
|
|
LINKS
|
David Applegate, The movie version
|
|
CROSSREFS
|
Cf. A000079, A139250, A153006, A160120, A161427, A161830.
Sequence in context: A007437 A159912 A049766 this_sequence A115759 A157615 A147478
Adjacent sequences: A161423 A161424 A161425 this_sequence A161427 A161428 A161429
|
|
KEYWORD
|
more,nonn
|
|
AUTHOR
|
Omar E. Pol (info(AT)polprimos.com) and David Applegate (david(AT)research.att.com), Jun 20 2009
|
|
|
Search completed in 0.002 seconds
|
