[seqfan] Re: Problem reproducing A019989, A019990, and A019991

[Marc LeBrun]

FWIW here's the claimed trisection as a single offset-0 sequence, with a(n) being 0, 1 or 2 when n is respectively in A019989, A019990 or A019991

0 1 0 1 1 0 0 1 0 1 2 1 1 1 0 0 0 2 0 1 0 1 1 0 0 1 0 1 2 1 2 2 1 1 1 0 1 2 1 1 1 0 0 0 2 0 1 0 0 0 2 2 0 2 0 1 0 1 1 0 0 1 0 1 2 1 1 1 0 0 0 2 0 1 0 1 1 0 0 1 0 1 2 1 2 2 1 1 2 1 2 0 2 2 2 1 1 1 0 1 2 1 1 1 0 0 1 0 1 2 1 2 2 1 1 1 0 1 2 1 1 1 0 0 0 2 0 1 0 0 0 2 2 0 2 0 1 0 1 1 0 0 0 2 0 1 0 0 0 2 2 2