a(n) = r_4(n^2 + 1), where r_4(k) is the number of ways of writing k as a sum of 4 squares (A000118).
A333173
a(n) = r_4(n^2 + 1), where r_4(k) is the number of ways of writing k as a sum of 4 squares (A000118).
Terms
- a(0) =8a(1) =24a(2) =48a(3) =144a(4) =144a(5) =336a(6) =304a(7) =744a(8) =672a(9) =1008a(10) =816a(11) =1488a(12) =1440a(13) =2592a(14) =1584a(15) =2736a(16) =2064a(17) =4320a(18) =3472a(19) =4368a(20) =3216a(21) =6048a(22) =4704a(23) =7776a(24) =4624a(25) =7536a(26) =5424a(27) =10656a(28) =7584a(29) =10128
External references
- oeis: A333173