A387661 a(n) is the number of valid initial configurations P with the maximum distance to I.

1, 1, 3, 8, 3, 15, 2, 27, 2, 29, 295, 20, 334, 3327, 205

Offset

1,3

Comments

Number of valid initial configurations P such that f(P) = A387318(n).

See A387318 for definitions, comments and formulas for the problem.

Links

Table of n, a(n) for n=1..15.

Example

For n = 4, A387318(n) = 3. For configurations P in {(0, 0, 2, 2), (0, 1, 0, 3), (0, 2, 0, 2), (0, 1, 3, 0), (0, 2, 2, 0), (1, 0, 0, 3), (0, 0, 0, 4), (1, 0, 3, 0)}, we have f(P) = 3 = A387318(n), so a(4) = 8.

Crossrefs

Cf. A387318.

Sequence in context: A046543 A233129 A035292 * A144457 A220138 A146975

Adjacent sequences: A387658 A387659 A387660 * A387662 A387663 A387664

Keyword

nonn,more

Author

Yifan Xie, Sep 05 2025

Extensions

a(15) from Sean A. Irvine, Sep 18 2025

Status

approved