Partial sums of icosahedral numbers (A006564).

Terms

a(0) =1a(1) =13a(2) =61a(3) =185a(4) =440a(5) =896a(6) =1638a(7) =2766a(8) =4395a(9) =6655a(10) =9691a(11) =13663a(12) =18746a(13) =25130a(14) =33020a(15) =42636a(16) =54213a(17) =68001a(18) =84265a(19) =103285a(20) =125356a(21) =150788a(22) =179906a(23) =213050a(24) =250575a(25) =292851a(26) =340263a(27) =393211a(28) =452110a(29) =517390