Open 3-dimensional ball numbers (version 2): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2,0,0).
A053594
Open 3-dimensional ball numbers (version 2): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2,0,0).
Terms
- a(0) =0a(1) =0a(2) =2a(3) =10a(4) =28a(5) =60a(6) =110a(7) =174a(8) =256a(9) =368a(10) =498a(11) =682a(12) =884a(13) =1140a(14) =1422a(15) =1750a(16) =2104a(17) =2560a(18) =3026a(19) =3546a(20) =4140a(21) =4828a(22) =5542a(23) =6382a(24) =7224a(25) =8136a(26) =9122a(27) =10274a(28) =11460a(29) =12732
External references
- oeis: A053594