Triangle read by rows, arising in enumeration of permutations by cyclic peaks.

Terms

a(0) =1a(1) =2a(2) =5a(3) =1a(4) =15a(5) =9a(6) =52a(7) =63a(8) =5a(9) =203a(10) =416a(11) =101a(12) =877a(13) =2741a(14) =1361a(15) =61a(16) =4140a(17) =18425a(18) =15602a(19) =2153a(20) =21147a(21) =127603a(22) =165786a(23) =46959a(24) =1385a(25) =115975a(26) =914508a(27) =1700220a(28) =823256a(29) =74841