191008

Appears in sequences

• Triangle T(n,r), read by rows, where the r-th column is expansion of A(x)^r, with A(x) = x * (x+1) * (2*x^4+4*x^3-2*x+1) * (x^4+2*x^3-x+1) / (x^2+x-1)^6.at n=48A187055
• Number of nXnXn triangular 0..4 arrays with no element equal to the sum mod 5 of any two neighbors.at n=4A193184
• E.g.f.: Sum_{n>=0} (1/n!) * Product_{k=1..n} tan(k*x).at n=7A193549