859952domain: NAppears in sequencesNumber of ways of writing n as a sum of 8 squares.at n=36A000143Theta series of D_8 lattice.at n=18A008430Number of ordered ways of writing n-th triangular number as a sum of n squares.at n=8A319221Number of ways of writing n^2 as a sum of 8 squares.at n=6A374493