20432

Appears in sequences

• Expansion of g.f. Product((1+x^i)/(1-x^i),i=1..n-1)/(1-x^n), with n = 6.at n=32A091774
• Numbers k such that if P = 10*k^2+1, then P, P+6, P+12 and P+18 are all primes.at n=41A092446
• Number of permutations of 1..n with the sum of squared adjacent differences <= (n-1)*n*(n+1)/6.at n=6A180072
• Number of right triangles on a (n+1) X 4 grid.at n=37A189808
• Expansion of Product_{n>0} ((1-x^n)/(1+x^n))^(n^2) in powers of x.at n=15A285988