Number of points in Z^7 of norm <= n.

Terms

a(0) =1a(1) =15a(2) =953a(3) =12435a(4) =88273a(5) =394691a(6) =1405325a(7) =4031123a(8) =10248133a(9) =23120727a(10) =48218513a(11) =93417543a(12) =172039681a(13) =299505299a(14) =503363697a(15) =813950491a(16) =1279144845a(17) =1950568311a(18) =2912136485a(19) =4244109647a(20) =6080556217a(21) =8545686087a(22) =11835454865