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 A171176 Triangle read by rows in which row n lists 3n-1 together with the first 2n-1 positive integers, in reverse order. 10
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) is also the length of the n-th L-toothpick added to the structure of A171166. LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS Index entries for sequences related to toothpick sequences 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 Cf. A000027, A016789, A172310, A171164, A161165, A161166, A171172, A171173, A171174, A171175, A171177, A171178. Cf. A132209 (row sums). - R. J. Mathar, Mar 01 2010 Sequence in context: A143409 A197387 A171177 * A332529 A213849 A067418 Adjacent sequences: A171173 A171174 A171175 * A171177 A171178 A171179 KEYWORD easy,nonn,tabf AUTHOR Omar E. Pol, Feb 23 2010 STATUS approved

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Last modified June 19 20:39 EDT 2024. Contains 373507 sequences. (Running on oeis4.)