A380189 a(n) is the number of coincidences of the first n terms of this sequence and the first n terms of A380188 in reverse order, i.e., the number of equalities a(k) = A380188(n-1-k) for 0 <= k < n.

0, 1, 0, 2, 0, 1, 1, 2, 1, 0, 3, 1, 0, 2, 0, 2, 2, 2, 2, 3, 3, 3, 1, 0, 3, 2, 3, 3, 4, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 3, 6, 6, 6, 6, 8, 7, 6, 5, 5, 5, 4, 4, 2, 1, 0, 3, 1, 0, 2, 0, 2, 2, 3, 5, 7, 7, 6, 5, 4, 5, 5, 6, 3, 2, 2, 1, 1, 4, 3, 1, 2, 3, 2, 4, 3, 4, 4

Offset

0,4

Links

Pontus von Brömssen, Table of n, a(n) for n = 0..20000

Example

For n = 7, the first 7 terms of this sequence and the first 7 terms of A380188 in reverse order are:
  0, 1, 0, 2, 0, 1, 1
  3, 3, 3, 2, 2, 1, 0
           ^     ^
with 2 coincidences, so a(7) = 2.

Crossrefs

Cf. A272727, A276638, A379266, A380188, A380190.

Sequence in context: A108455 A193759 A117468 * A379266 A340453 A116374

Adjacent sequences: A380185 A380186 A380188 * A380190 A380208 A380209

Keyword

nonn,look,new

Author

Pontus von Brömssen, Jan 15 2025

Status

approved