3912488

Appears in sequences

• Number of perfect matchings on a Möbius strip of width 3 and length 2n.at n=9A263200
• a(n) = ((1 - sqrt(3))^n + (1 + sqrt(3))^n)/2^floor((n - 1)/2); n-th row common denominator of A321118.at n=22A321119