Closed 3-dimensional ball numbers (version 2): a(n)= number of integer points (i,j,k) contained in a closed ball of diameter n, centered at (1/2,0,0).

A053593

Closed 3-dimensional ball numbers (version 2): a(n)= number of integer points (i,j,k) contained in a closed ball of diameter n, centered at (1/2,0,0).

Terms

    a(0) =0a(1) =2a(2) =2a(3) =20a(4) =28a(5) =70a(6) =110a(7) =192a(8) =256a(9) =402a(10) =498a(11) =708a(12) =884a(13) =1166a(14) =1422a(15) =1800a(16) =2104a(17) =2594a(18) =3026a(19) =3588a(20) =4140a(21) =4918a(22) =5542a(23) =6432a(24) =7224a(25) =8186a(26) =9122a(27) =10380a(28) =11460a(29) =12790

External references