Number A(n,k) of up-down sequences with k copies each of 1,2,...,n; square array A(n,k), n>=0, k>=0, read by antidiagonals.
A275784
Number A(n,k) of up-down sequences with k copies each of 1,2,...,n; square array A(n,k), n>=0, k>=0, read by antidiagonals.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =0a(8) =1a(9) =1a(10) =1a(11) =0a(12) =1a(13) =2a(14) =1a(15) =1a(16) =0a(17) =1a(18) =4a(19) =5a(20) =1a(21) =1a(22) =0a(23) =1a(24) =12a(25) =53a(26) =16a(27) =1a(28) =1a(29) =0
External references
- oeis: A275784