Open 3-dimensional ball numbers (version 3): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2,1/2,0).
A053595
Open 3-dimensional ball numbers (version 3): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2,1/2,0).
Terms
- a(0) =0a(1) =0a(2) =4a(3) =12a(4) =36a(5) =56a(6) =112a(7) =168a(8) =268a(9) =372a(10) =536a(11) =680a(12) =888a(13) =1132a(14) =1452a(15) =1740a(16) =2160a(17) =2544a(18) =3048a(19) =3556a(20) =4196a(21) =4812a(22) =5552a(23) =6304a(24) =7248a(25) =8116a(26) =9220a(27) =10280a(28) =11512a(29) =12656
External references
- oeis: A053595