Number of ways of writing n as a sum of 4 squares; also theta series of four-dimensional cubic lattice Z^4.
A000118
Number of ways of writing n as a sum of 4 squares; also theta series of four-dimensional cubic lattice Z^4.
Terms
- a(0) =1a(1) =8a(2) =24a(3) =32a(4) =24a(5) =48a(6) =96a(7) =64a(8) =24a(9) =104a(10) =144a(11) =96a(12) =96a(13) =112a(14) =192a(15) =192a(16) =24a(17) =144a(18) =312a(19) =160a(20) =144a(21) =256a(22) =288a(23) =192a(24) =96a(25) =248a(26) =336a(27) =320a(28) =192a(29) =240
External references
- oeis: A000118