22137570

Appears in sequences

• Fermat coefficients.at n=23A000973
• Member k=6 of a family of generalized Catalan numbers.at n=7A130565
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/6)} a(6*k) * a(n-1-6*k).at n=47A386380