The first open case is 11. Is a(11) = -1? See A329493.
If a(i) = m > 0 then A328882 takes the value -i for the first time at term 2^m-i. For example, the first appearance of -7 in A328882 is at term 2^103 - 7.
Table of n, a(n) for n=1..10.
Cf. A328882, A329002, A329493.
Sequence in context: A057063 A108236 A002849 * A163234 A072984 A317310
Adjacent sequences: A329489 A329490 A329491 * A329493 A329494 A329495
N. J. A. Sloane, Nov 16 2019