Table of n, a(n) for n=1..28.
Cf. A000118 = number of ways of writing n as a sum of 4 squares; theta series of lattice Z^4.
Sequence in context: A044069 A028628 A333427 * A283078 A319528 A140403
Adjacent sequences: A128687 A128688 A128689 * A128691 A128692 A128693
Jonathan Vos Post, Mar 21 2007
Data corrected by Giovanni Resta, Jun 18 2016