Number of (w,x,y,z) with all terms in {1,...,n} and w^2>=x^2+y^2+z^2.

Terms

a(0) =0a(1) =0a(2) =1a(3) =8a(4) =25a(5) =63a(6) =141a(7) =268a(8) =464a(9) =760a(10) =1170a(11) =1734a(12) =2472a(13) =3430a(14) =4650a(15) =6164a(16) =8012a(17) =10247a(18) =12933a(19) =16108a(20) =19827a(21) =24192a(22) =29199a(23) =34957a(24) =41525a(25) =48967a(26) =57382a(27) =66859a(28) =77456a(29) =89235