Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
Table of n, a(n) for n=1..26.
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