Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k as the first entry in the last block (1<=k<=n).
A177264
Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k as the first entry in the last block (1<=k<=n).
Terms
- a(0) =1a(1) =2a(2) =0a(3) =4a(4) =1a(5) =1a(6) =10a(7) =5a(8) =5a(9) =4a(10) =34a(11) =23a(12) =23a(13) =22a(14) =18a(15) =154a(16) =119a(17) =119a(18) =118a(19) =114a(20) =96a(21) =874a(22) =719a(23) =719a(24) =718a(25) =714a(26) =696a(27) =600a(28) =5914a(29) =5039
External references
- oeis: A177264