OFFSET
1,1
COMMENTS
a(n) is also the length of the n-th L-toothpick added to the structure of A171166.
LINKS
EXAMPLE
Triangle begins:
2, 1;
5, 3, 2, 1;
8, 5, 4, 3, 2, 1;
11, 7, 6, 5, 4, 3, 2, 1;
14, 9, 8, 7, 6, 5, 4, 3, 2, 1;
17, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1;
20, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1;
23, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1;
26, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1;
MATHEMATICA
Table[{3n-1, Reverse[Range[2n-1]]}, {n, 10}]//Flatten (* Harvey P. Dale, Jun 26 2022 *)
CROSSREFS
KEYWORD
easy,nonn,tabf
AUTHOR
Omar E. Pol, Feb 23 2010
STATUS
approved