305046domain: NAppears in sequencesa(n) = ((2*n+1)/(n+1))*Sum_{j=0..n/2} binomial(n+1, j)*binomial(n-j-1, n-2*j).at n=13A278646Numbers k such that k, k+1 and k+2 are all in A362401.at n=16A362405Expansion of Sum_{1<=i<=j<=k} q^(i+j+k)/( (1-q^i)*(1-q^j)*(1-q^k) )^2.at n=26A374930