A389306 Row sums of triangle A387098.

2, 1, 1, 3, 15, 91, 647, 5245, 48287, 625817, 36494225, 6862660263, 1568810412647, 390685537439419, 106288930934710885

Offset

1,1

Comments

a(n) is the total number of ways to place non-attacking kings on an n X n board such that each row and each column contains the same number of kings.

Links

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

Formula

a(n) = Sum_{k=0..floor(n/4)+[n=1]} A387098(n, k).

Crossrefs

Cf. A387098.

Sequence in context: A134357 A049258 A228832 * A379217 A247518 A078076

Adjacent sequences: A389303 A389304 A389305 * A389307 A389308 A389309

Keyword

nonn,more

Author

Hamidreza Maleki Tirabadi, Dec 07 2025

Status

approved