T(n,k) is the number of permutations of the multiset {1, 1, 1, 2, 2, 2, ..., n, n, n} with k occurrences of fixed triples (j,j,j), where T(n,k), n >= 2, 0 <= k <= n-2 is a triangle read by rows.
A375219
T(n,k) is the number of permutations of the multiset {1, 1, 1, 2, 2, 2, ..., n, n, n} with k occurrences of fixed triples (j,j,j), where T(n,k), n >= 2, 0 <= k <= n-2 is a triangle read by rows.
Terms
- a(0) =19a(1) =1622a(2) =57a(3) =362997a(4) =6488a(5) =114a(6) =166336604a(7) =1814985a(8) =16220a(9) =190a(10) =136221590695a(11) =998019624a(12) =5444955a(13) =32440a(14) =285a(16) =953551134865a(17) =3493068684a(18) =12704895a(19) =56770a(20) =399a(24) =9314849824a(25) =25409790a(26) =90832a(27) =532
External references
- oeis: A375219