-2656

Appears in sequences

• Hankel transform of Euler totient function (A000010).at n=6A056229
• A triangle of coefficients of a product polynomial sequence based on Chebyshev T:differentiation of T[(x,n) which gives U(x,n): p(x,n) = Product_{m=0..n} Sum_{i=0..m} (d/dx) T(x,i+1).at n=17A139809
• O.g.f.: exp( Sum_{n>=1} -(sigma(2*n^3) - sigma(n^3)) * (-x)^n/n ).at n=10A225957
• Hankel transform of A000265 (odd part of n).at n=5A229628
• Expansion of Sum_{k>0} x^(4*k)/(1+x^k)^4.at n=26A363616