Number of distinct products i*j with 0 <= i, j <= n.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =10a(5) =15a(6) =19a(7) =26a(8) =31a(9) =37a(10) =43a(11) =54a(12) =60a(13) =73a(14) =81a(15) =90a(16) =98a(17) =115a(18) =124a(19) =143a(20) =153a(21) =165a(22) =177a(23) =200a(24) =210a(25) =226a(26) =240a(27) =255a(28) =268a(29) =297