33538048

Appears in sequences

• Number of Barlow packings with group P63mc that repeat after 2n layers.at n=26A011948
• a(n) = A053656(n) - A000011(n).at n=31A256216
• a(n) = 2*a(n-1) + 2*a(n-2) - 4*a(n-3), a(1) = 0, a(2) = 0, a(3) = 8.at n=23A297619