855057

Appears in sequences

• Number of 0..2 integer arrays v[1..n] of length n with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..n-1.at n=17A171308
• G.f. A(x) satisfies: A( x*A(x) - x*A(x)^2 ) = x^2.at n=14A265940