Triangle T(b,k) read by rows, giving numbers of pairs of unequal permutations of all the digits 1, ..., k in base b (k<b) whose ratio is an integer.

A080202

Triangle T(b,k) read by rows, giving numbers of pairs of unequal permutations of all the digits 1, ..., k in base b (k<b) whose ratio is an integer.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =0a(4) =0a(5) =1a(6) =0a(7) =0a(8) =3a(9) =25a(10) =0a(11) =0a(12) =0a(13) =2a(14) =7a(15) =0a(16) =0a(17) =0a(18) =0a(19) =68a(20) =623a(21) =0a(22) =0a(23) =0a(24) =0a(25) =0a(26) =124a(27) =1183a(28) =0a(29) =0

External references