A195838 - OEIS

A195838

Triangle read by rows which arises from A195828, in the same way as A175003 arises from A195310. Column k starts at row A001082(k+1).

1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 4, 1, -1, 4, 1, -1, 4, 2, -1, 5, 3, -1, 7, 4, -1, 10, 4, -2, 12, 4, -3, 13, 5, -4, 14, 7, -4, -1, 16, 10, -4, -1, 21, 12, -5, -1, 27, 13, -7, -1, 32, 14, -10, -1, 35, 16, -12, -2, 1, 38, 21, -13, -3, 1, 44, 32, -14, -4, 1

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OFFSET

1,7

COMMENTS

The sum of terms of row n is equal to the leftmost term of row n+1. This sequence is related to the generalized octagonal numbers A001082, A195828 and A195848 in the same way as A175003 is related to the generalized pentagonal numbers A001318, A195310 and A000041. See comments in A195825.

LINKS

Table of n, a(n) for n=1..69.

EXAMPLE

Written as a triangle:

. 1;

. 1, 1;

. 2, 1;

. 3, 1;

. 4, 1, -1;

. 4, 2, -1;

. 5, 3, -1;

. 7, 4, -1;

. 10, 4, -2;

. 12, 4, -3;

. 13, 5, -4;

. 14, 7, -4, -1;

. 16, 10, -4, -1;

. 21, 12, -5, -1;

. 27, 13, -7, -1;

. 32, 14, -10, -1;

. 35, 16, -12, -2, 1;

. 38, 21, -13, -3, 1;

CROSSREFS

Row sums give A195848.

Cf. A001082, A175003, A195828, A195836, A195837.

Sequence in context: A195841 A195840 A195839 * A195837 A123539 A142593

Adjacent sequences: A195835 A195836 A195837 * A195839 A195840 A195841

KEYWORD

sign,tabf

AUTHOR

Omar E. Pol, Sep 24 2011

STATUS

approved