18474633domain: NAppears in sequencesa(n) = Sum_{k=0..n-1} binomial(n,k+1) * binomial(n+k,k).at n=11A002002Crystal ball sequence for 10-dimensional cubic lattice.at n=11A008421a(n) = T([n/2],[(n+1)/2]), where T = Delannoy triangle (A008288).at n=21A026003Expansion of (1 + x)^11 / (1 - x)^12.at n=10A240876