Triangle read by rows: number of Dyck paths of semilength n with k peaks before the first return (1<= k <n).
A101974
Triangle read by rows: number of Dyck paths of semilength n with k peaks before the first return (1<= k <n).
Terms
- a(0) =1a(1) =2a(2) =4a(3) =1a(4) =9a(5) =4a(6) =1a(7) =23a(8) =11a(9) =7a(10) =1a(11) =65a(12) =27a(13) =28a(14) =11a(15) =1a(16) =197a(17) =66a(18) =87a(19) =62a(20) =16a(21) =1a(22) =626a(23) =170a(24) =239a(25) =250a(26) =122a(27) =22a(28) =1a(29) =2056
External references
- oeis: A101974