132678

Appears in sequences

• a(n) = n^2*(n^2 - 1)/4.at n=27A006011
• a(n) = Sum_{d|n, d=3 mod 4} d^3.at n=50A050454
• Numbers whose 4th power can be expressed as the sum of two positive cubes in more than one way.at n=30A051388
• Number of (w,x,y,z) with all terms in {0,...,n}, w even and x odd.at n=26A212766
• Principal diagonal of the convolution array A213579.at n=17A213580
• Numbers in A003325 whose 4th power is the sum of two positive cubes in a nontrivial way.at n=18A282872
• a(n) = 2*n^3 + 9*n^2 + 9*n.at n=39A303609
• Numbers k such that k and uphi(k) have the same set of prime divisors, where uphi is the unitary totient function (A047994).at n=36A329859
• a(n) = Sum_{k=1..n} k * lcm(k,n).at n=26A344508
• Expansion of e.g.f. cosh( (exp(3*x) - 1)/sqrt(3) ).at n=7A357662