Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k as the last entry in the first block (1<=k<=n).
A177263
Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k as the last entry in the first block (1<=k<=n).
Terms
- a(0) =1a(1) =0a(2) =2a(3) =1a(4) =1a(5) =4a(6) =4a(7) =5a(8) =5a(9) =10a(10) =18a(11) =22a(12) =23a(13) =23a(14) =34a(15) =96a(16) =114a(17) =118a(18) =119a(19) =119a(20) =154a(21) =600a(22) =696a(23) =714a(24) =718a(25) =719a(26) =719a(27) =874a(28) =4320a(29) =4920
External references
- oeis: A177263