Number of (w,x,y,z) with all terms in {1,...,n} and 2w*x<=3*y*z.

Terms

a(0) =0a(1) =1a(2) =11a(3) =58a(4) =176a(5) =407a(6) =840a(7) =1536a(8) =2591a(9) =4133a(10) =6268a(11) =9119a(12) =12895a(13) =17684a(14) =23706a(15) =31201a(16) =40315a(17) =51239a(18) =64352a(19) =79770a(20) =97829a(21) =118795a(22) =142947a(23) =170548a(24) =202114a(25) =237757a(26) =277915a(27) =323080a(28) =373489a(29) =429449