701191domain: NAppears in sequences1729-gonal numbers.at n=28A130859Number of (n+1)X9 0..2 arrays with each element of every 2X2 subblock being the sum mod 3 of two others.at n=0A183835T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with each element of every 2X2 subblock being the sum mod 3 of two others.at n=28A183836