643230

Appears in sequences

• Number of Barlow packings with group P63mc that repeat after 2n layers.at n=20A011948
• a(n) = A053656(n) - A000011(n).at n=25A256216
• Number of subsets S of {A007931(1), A007931(2), ..., A007931(n)} with the property that no element of S is a substring of any other.at n=36A363145