Number of (w,x,y,z) with all terms in {1,...,n} and w^3<=x^3+y^3+z^3.

Terms

a(0) =0a(1) =1a(2) =15a(3) =72a(4) =221a(5) =536a(6) =1104a(7) =2034a(8) =3451a(9) =5514a(10) =8380a(11) =12246a(12) =17322a(13) =23812a(14) =31981a(15) =42107a(16) =54457a(17) =69350a(18) =87100a(19) =108049a(20) =132591a(21) =161085a(22) =193966a(23) =231592a(24) =274511a(25) =323077a(26) =377830a(27) =439314a(28) =507948a(29) =584401