400023

Appears in sequences

• Witt vector *2!/2!.at n=12A006177
• Number of binary Lyndon words containing n letters of each type; periodic binary sequences of period 2n with n zeros and n ones in each period.at n=13A022553
• (binomial(2*p,p)-2)/(2*p) where p runs through the primes.at n=5A086655
• Formal infinite product representation for the Catalan numbers (A000108) o.g.f. series.at n=12A157161
• Product_{n>=1} (1+x^n)^a(n) = Sum_{k>=0} C(k)*x^k, where C(k) = A000108(k).at n=12A378424
• Triangle read by rows: T(n,k) is the number of 2n-bead balanced binary necklaces with period length 2n/k.at n=78A385666