https://oeis.org/A306861 https://oeis.org/A272232 I've had a private message from someone pointing out that "A306861 is in fact a subsequence of A272232". Except that A306861 uses -1 for its nonexisting terms and A272232 uses 0. The latter is the older sequence. Should A306861's nonexisting terms be modified to 0 before commenting on the relationship?