Theta series of simple cubic lattice; also number of ways of writing a nonnegative integer n as a sum of 3 squares (zero being allowed).

A005875

Theta series of simple cubic lattice; also number of ways of writing a nonnegative integer n as a sum of 3 squares (zero being allowed).

Terms

    a(0) =1a(1) =6a(2) =12a(3) =8a(4) =6a(5) =24a(6) =24a(7) =0a(8) =12a(9) =30a(10) =24a(11) =24a(12) =8a(13) =24a(14) =48a(15) =0a(16) =6a(17) =48a(18) =36a(19) =24a(20) =24a(21) =48a(22) =24a(23) =0a(24) =24a(25) =30a(26) =72a(27) =32a(28) =0a(29) =72

External references