Decimal representation of permutations of lengths 1, 2, 3, ...

Terms

a(0) =1a(1) =21a(2) =312a(3) =132a(4) =231a(5) =321a(6) =4123a(7) =1423a(8) =2413a(9) =4213a(10) =1243a(11) =2143a(12) =3412a(13) =4312a(14) =1342a(15) =3142a(16) =4132a(17) =1432a(18) =2341a(19) =3241a(20) =4231a(21) =2431a(22) =3421a(23) =4321a(24) =51234a(25) =15234a(26) =25134a(27) =52134a(28) =12534a(29) =21534