-19026

Appears in sequences

• G.f. A(x) satisfies: 1 = ...((((A(x) - 2*x)^2 - 4*x^2)^2 - 8*x^3)^2 - 16*x^4)^2 -... - 2^n*x^n)^2 -...., a series of infinite nested squares.at n=21A274850
• Fourier coefficients of the modular form (1/28)*(E_6(t)+27*E_6(3*t)).at n=4A341305