Number of peaks at even level in all Schroeder paths (i.e., consisting of steps U=(1,1), D=(1,-1), H=(2,0) and never going below the axis) from (0,0) to (2n+4,0).
A089383
Number of peaks at even level in all Schroeder paths (i.e., consisting of steps U=(1,1), D=(1,-1), H=(2,0) and never going below the axis) from (0,0) to (2n+4,0).
Terms
- a(0) =1a(1) =8a(2) =49a(3) =280a(4) =1569a(5) =8752a(6) =48833a(7) =272976a(8) =1529441a(9) =8589176a(10) =48342449a(11) =272640680a(12) =1540495553a(13) =8718956768a(14) =49423735553a(15) =280551815456
External references
- oeis: A089383