1855040domain: NAppears in sequencesTriangle T(n,m) read by rows, obtained from [A(x)]^m = Sum_{n>=m} T(n,m)*x^n, where A(x) (the g.f. for A069271) satisfies 2*x^2*A(x)^3 = 1 - 2*x*A(x) - sqrt(1-4*x*A(x)).at n=58A188108Number of additive codes of type (1,1) over Z_4[xi].at n=3A217939a(n) = 2*binomial(4*n + 8, n)/(n + 2).at n=7A233666