2972176domain: NAppears in sequencesDefine sds(n) = sum of the squares of the digits of n. Sequence gives smaller of two consecutive squares with sds(k^2) = sds((k+1)^2).at n=10A069645Expansion of e.g.f.: exp(16*x/(1-x)) / sqrt(1-x^2).at n=5A202878