83950

Appears in sequences

• Number of unlabeled connected series-parallel posets with n nodes.at n=10A007453
• a(n) = T(2n,n+3), T given by A026736.at n=7A026852
• Expansion of Product_{n>=1} ((1 + 8*x^n)/(1 - 8*x^n))^(1/8).at n=7A303382
• a(n) is the least number x such that x^2 + 1 and 2^x + 1 are both divisible by A387595(n).at n=45A387642