31294

Appears in sequences

• a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, starting 1,0,-1,1.at n=17A025279
• a(n) gives the number of nonisomorphic connected compact Lie groups of dimension n which are simple products.at n=59A177821
• G.f.: 1/(1 - x^2/(1 - x^5/(1 - x^8/(1 - x^11/(1 - x^14/(1 - x^17/(1 -...- x^(3*n-1)/(1 -...)))))))), a continued fraction.at n=52A206738
• Number of (w,x,y,z) with all terms in {1,...,n} and w < harmonic mean of {x,y,z}.at n=17A212106
• a(n) = Sum_{i=0..n} digsum_7(i)^4, where digsum_7(i) = A053828(i).at n=28A231679
• Numbers k such that (35*10^k - 737)/9 is prime.at n=18A295397