Convolution square of A001157 (the sum of squared divisors).

Terms

a(0) =1a(1) =10a(2) =45a(3) =142a(4) =362a(5) =780a(6) =1561a(7) =2762a(8) =4808a(9) =7570a(10) =12034a(11) =17482a(12) =26072a(13) =35884a(14) =50909a(15) =67012a(16) =92111a(17) =116950a(18) =155720a(19) =193564a(20) =250914a(21) =304244a(22) =389286a(23) =461654a(24) =578952a(25) =680944a(26) =839304a(27) =970094a(28) =1188924a(29) =1354164