434493domain: NAppears in sequencesa(n) = Sum_{k=1..n} ((-1)^(n-k) * k / ((n+1)^2 + (k-1)*(n+1))) * binomial(n+1, k+1) * binomial(n+k, k)^2.at n=8A271777Triangle T(n,k) read by rows: the number of independent sets of size k in the 132 core of size n.at n=44A278390