Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and have k peaks of the form ud.
A108446
Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and have k peaks of the form ud.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =5a(5) =1a(6) =20a(7) =32a(8) =13a(9) =1a(10) =113a(11) =223a(12) =135a(13) =26a(14) =1a(15) =688a(16) =1620a(17) =1300a(18) =412a(19) =45a(20) =1a(21) =4404a(22) =12064a(23) =12050a(24) =5350a(25) =1030a(26) =71a(27) =1a(28) =29219a(29) =91335
External references
- oeis: A108446