Triangle read by rows, arising in enumeration of permutations by cyclic valleys, cycles and fixed points.

A216964

Triangle read by rows, arising in enumeration of permutations by cyclic valleys, cycles and fixed points.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =22a(4) =2a(5) =94a(6) =26a(7) =460a(8) =244a(9) =16a(10) =2532a(11) =2124a(12) =384a(13) =15420a(14) =18536a(15) =6092a(16) =272a(17) =102620a(18) =166440a(19) =83436a(20) =10384a(21) =739512a(22) =1550864a(23) =1082712a(24) =247776a(25) =7936a(26) =5729192a(27) =15040112a(28) =13841928a(29) =4864480

External references