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 A171177 Triangle read by rows in which row n lists 3n-1 together with the first 2n-1 numbers <> 0 of A038608, in reverse order. 9
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Absolute values give A171176. Note that the partial sums of this sequence give A171178, a permutation of the natural numbers. 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; CROSSREFS Cf. A016789, A038608, A172310, A171164, A161165, A161166, A171172, A171173, A171174, A171175, A171176, A171178. Sequence in context: A188392 A143409 A197387 * A171176 A213849 A067418 Adjacent sequences:  A171174 A171175 A171176 * A171178 A171179 A171180 KEYWORD easy,sign,tabf AUTHOR Omar E. Pol, Feb 23 2010 STATUS approved

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Last modified March 28 07:59 EDT 2020. Contains 333079 sequences. (Running on oeis4.)