Number a(n,k) of positions (cyclic permutations) of circular permutations of [n] with exactly k (unspecified) increasing or decreasing modular runs (3-sequences), with clockwise and counterclockwise traversals counted as distinct; triangle a(n,k) read by rows, 0<=k<=n.
A235943
Number a(n,k) of positions (cyclic permutations) of circular permutations of [n] with exactly k (unspecified) increasing or decreasing modular runs (3-sequences), with clockwise and counterclockwise traversals counted as distinct; triangle a(n,k) read by rows, 0<=k<=n.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =6a(10) =16a(11) =0a(12) =0a(13) =0a(14) =8a(15) =60a(16) =50a(17) =0a(18) =0a(19) =0a(20) =10a(21) =456a(22) =144a(23) =108a(24) =0a(25) =0a(26) =0a(27) =12a(28) =3458a(29) =1078
External references
- oeis: A235943