680079

Appears in sequences

• Dimension of 7-variable non-commutative harmonics (twisted derivative). The dimension of the space of non-commutative polynomials in 7 variables which are killed by all symmetric differential operators (where for a monomial w, d_{xi} ( xi w ) = w and d_{xi} ( xj w ) = 0 for i/=j).at n=7A122371
• Number of length-4 0..n arrays with no following elements larger than the first repeated value.at n=27A267472
• G.f. A(x) satisfies A(x) = 1 + x^2*(1+x)^3*A(x)^4.at n=13A366593