178284892domain: NAppears in sequencesTriangle U, read by rows, where column k of U^(j+1) = column j of P^(3k+1) for j>=0, k>=0 and P=A136220.at n=46A136228Column 1 of triangle A136228; also equals column 3 of square array A136217.at n=8A136229Triangle, read by rows, equal to the matrix 4th power of triangle A136220.at n=36A136232