[seqfan] Re: Add or subtract my cumulative sum of terms
Éric Angelini
bk263401 at skynet.be
Mon Feb 24 18:10:45 CET 2020
The variant with "terms" instead of "digits" shows a regular pattern:
> Variant:
> start T with a(1) = 1 and now:
> if a(n) is odd, add to a(n) the cumultive sum Q of the terms of T;
> if a(n) is even, subtract Q from a(n) to get a(n+1);
op + - + + - + + - + + - + + - + + - +
T = 1, 2, -1, 1, 4, -3, 1, 6, -5, 1, 8, -7, 1, 10, -9, 1, 12, -11, ...
Q = 1 3 2 3 7 4 5 11 6 7 15 8 9 19 10 11 23 12
Neither T nor Q (regular pattern too) are in the OEIS.
Best,
É.
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