130697

Appears in sequences

• Number of dumbbells in all possible arrangements of dumbbells on a 2 X n rectangular array of compartments.at n=8A123518
• Number of aperiodic necklaces (Lyndon words) with k<=6 black beads and n-k white beads.at n=41A277631
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + b(n-2), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=20A294550