Triangle read by rows: T(n,k) (n>=0, 0<=k<=floor(n/2)) is the number of permutations of n and k valleys (considered cyclically).

A263789

Triangle read by rows: T(n,k) (n>=0, 0<=k<=floor(n/2)) is the number of permutations of n and k valleys (considered cyclically).

Terms

    a(0) =1a(1) =1a(2) =0a(3) =2a(4) =0a(5) =6a(6) =0a(7) =16a(8) =8a(9) =0a(10) =40a(11) =80a(12) =0a(13) =96a(14) =528a(15) =96a(16) =0a(17) =224a(18) =2912a(19) =1904a(20) =0a(21) =512a(22) =14592a(23) =23040a(24) =2176a(25) =0a(26) =1152a(27) =69120a(28) =221184a(29) =71424

External references