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A195837 Triangle read by rows which arises from A195827, in the same way as A175003 arises from A195310. Column k starts at row A085787(k). 12
1, 1, 1, 1, 1, 2, 1, 3, 1, 4, 1, -1, 4, 2, -1, 5, 3, -1, 7, 4, -1, 10, 4, -2, 12, 5, -3, 14, 7, -4, -1, 16, 10, -4, -1, 21, 12, -5, -1, 27, 14, -7, -1, 33, 16, -10, -2, 37, 21, -12, -3, 1, 44, 27, -14, -4, 1, 54, 33, -16, -4, 1, 68, 37, -21, -5, 1, 80, 44, -27, -7, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
COMMENTS
The sum of terms of row n is equal to the leftmost term of row n+1. It appears that this sequence is related to the generalized heptagonal numbers A085787, A195827 and A036820 in the same way as A175003 is related to the generalized pentagonal numbers A001318, A195310 and A000041. It appears that row sums give A036820. See comments in A195825.
LINKS
EXAMPLE
Written as a triangle:
. 1;
. 1;
. 1;
. 1, 1;
. 2, 1;
. 3, 1;
. 4, 1, -1;
. 4, 2, -1;
. 5, 3, -1;
. 7, 4, -1;
. 10, 4, -2;
. 12, 5, -3;
. 14, 7, -4, -1;
. 16, 10, -4, -1;
. 21, 12, -5, -1;
. 27, 14, -7, -1;
. 33, 16, -10, -2;
. 37, 21, -12, -3, 1;
. 44, 27, -14, -4, 1;
. 54, 33, -16, -4, 1;
CROSSREFS
Sequence in context: A195840 A195839 A195838 * A123539 A142593 A360285
KEYWORD
sign,tabf
AUTHOR
Omar E. Pol, Sep 24 2011
STATUS
approved

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Last modified March 19 07:31 EDT 2024. Contains 370955 sequences. (Running on oeis4.)