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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

Table of n, a(n) for n=1..76.

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.)