1997688

Appears in sequences

• Fermat coefficients.at n=21A000972
• Number of dissections of a polygon: binomial(7n,n)/(6n+1).at n=7A002296
• a(n) = binomial(n^2, n)/(1+(n-1)*n).at n=7A091144
• Generalized or s-Catalan numbers.at n=34A137211
• G.f. A(x) satisfies A(x) = 1 + x*A(x)^4*A(-x)^3.at n=14A143547
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/6)} a(6*k) * a(n-1-6*k).at n=42A386380