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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: A056196 A044069 A028628 * A140403 A108578 A044450
Adjacent sequences: A128687 A128688 A128689 * A128691 A128692 A128693
Jonathan Vos Post, Mar 21 2007
Data corrected by Giovanni Resta, Jun 18 2016