Nonnegative numbers of the form x^y - y^x, for x,y > 1.

Terms

a(0) =0a(1) =1a(2) =7a(3) =17a(4) =28a(5) =79a(6) =118a(7) =192a(8) =399a(9) =431a(10) =513a(11) =924a(12) =1844a(13) =1927a(14) =2800a(15) =3952a(16) =6049a(17) =7849a(18) =8023a(19) =13983a(20) =16188a(21) =18954a(22) =32543a(23) =58049a(24) =61318a(25) =61440a(26) =65280a(27) =130783a(28) =162287a(29) =175816