Triangle read by rows: T(n,m) (0<=m<=n) = number of positive n-digit numbers that have exactly m copies of a specific, previously selected positive base-10 digit among its digits.
A380860
Triangle read by rows: T(n,m) (0<=m<=n) = number of positive n-digit numbers that have exactly m copies of a specific, previously selected positive base-10 digit among its digits.
Terms
- a(0) =1a(1) =8a(2) =1a(3) =72a(4) =17a(5) =1a(6) =648a(7) =225a(8) =26a(9) =1a(10) =5832a(11) =2673a(12) =459a(13) =35a(14) =1a(15) =52488a(16) =29889a(17) =6804a(18) =774a(19) =44a(20) =1a(21) =472392a(22) =321489a(23) =91125a(24) =13770a(25) =1170a(26) =53a(27) =1a(28) =4251528a(29) =3365793
External references
- oeis: A380860