Number of nonnegative solutions of x1^2 + x2^2 + ... + x7^2 = n.

Terms

a(0) =1a(1) =7a(2) =21a(3) =35a(4) =42a(5) =63a(6) =112a(7) =141a(8) =126a(9) =154a(10) =259a(11) =315a(12) =280a(13) =308a(14) =462a(15) =567a(16) =497a(17) =462a(18) =693a(19) =910a(20) =798a(21) =749a(22) =1078a(23) =1281a(24) =1092a(25) =1043a(26) =1407a(27) =1715a(28) =1576a(29) =1449