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A195840
Triangle read by rows which arises from A195830, in the same way as A175003 arises from A195310. Column k starts at row A074377(k).
10
1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 4, 1, -1, 4, 1, -1, 4, 1, -1, 4, 1, -1, 4, 2, -1, 5, 3, -1, 7, 4, -1, 10, 4, -2, 12, 4, -3, 13, 4, -4, 13, 4, -4, 13, 5, -4, 14, 7, -4, -1, 16, 10, -4, -1, 21, 12, -5, -1, 27, 13, -7, -1, 32, 13, -10, -1, 34
OFFSET
1,9
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 decagonal numbers A074377, A195830 and A195850 in the same way as A175003 is related to the generalized pentagonal numbers A001318, A195310 and A000041. See comments in A195825.
EXAMPLE
Written as a triangle:
. 1;
. 1;
. 1;
. 1;
. 1;
. 1;
. 1, 1;
. 2, 1;
. 3, 1;
. 4, 1, -1;
. 4, 1, -1;
. 4, 1, -1;
. 4, 1, -1;
. 4, 2, -1;
. 5, 3, -1;
. 7, 4, -1;
. 10, 4, -2;
. 12, 4, -3;
. 13, 4, -4;
. 13, 4, -4;
. 13, 5, -4;
. 14, 7, -4, -1;
. 16, 10, -4, -1;
. 21, 12, -5, -1;
. 27, 13, -7, -1;
. 32, 13, -10, -1;
. 34, 13, -12, -1, 1;
CROSSREFS
KEYWORD
sign,tabf
AUTHOR
Omar E. Pol, Sep 24 2011
STATUS
approved