30668

Appears in sequences

• Decimal part of a(n)^(1/5) starts with a 'nine digits' anagram.at n=16A034280
• Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 4 which is flat, i.e., with all blocks in parallel position.at n=5A123780
• O.g.f.: Sum_{n>=0} n^n * (1+n*x)^(2*n) * x^n/n! * exp(-n*x*(1+n*x)^2).at n=7A218677
• G.f. = b(2)*b(6)*b(10)/(x^14+x^12-x^5-x^3-x+1), where b(k) = (1-x^k)/(1-x).at n=19A266334
• Symmetric difference of the primitive non-deficient numbers and the primitive Zumkeller numbers.at n=9A378538
• Numbers that are primitive Zumkeller, but not primitive non-deficient.at n=6A378657