2057510

Appears in sequences

• a(0) = 1; for n > 0, a(n) = binomial(n, floor(n/2)) + binomial(n-1, floor(n/2)).at n=23A050168
• a(n) = C(n)*(3n+2) where C(n) = Catalan numbers = A000108.at n=11A051960
• Expansion of (1+x)/(1-x)^12.at n=12A057788