Open 3-dimensional ball numbers (version 4): 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, 1/2).
A053596
Open 3-dimensional ball numbers (version 4): 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, 1/2).
Terms
- a(0) =0a(1) =0a(2) =8a(3) =8a(4) =32a(5) =56a(6) =136a(7) =160a(8) =280a(9) =360a(10) =552a(11) =672a(12) =912a(13) =1088a(14) =1472a(15) =1736a(16) =2176a(17) =2512a(18) =3112a(19) =3544a(20) =4224a(21) =4776a(22) =5616a(23) =6272a(24) =7208a(25) =8144a(26) =9328a(27) =10144a(28) =11536a(29) =12712
External references
- oeis: A053596