Triangle read by rows: T(n,k) is the number of walks (each step +-1) of length 2n which have a cumulative value of 0 last at step 2k.
A067804
Triangle read by rows: T(n,k) is the number of walks (each step +-1) of length 2n which have a cumulative value of 0 last at step 2k.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =6a(4) =4a(5) =6a(6) =20a(7) =12a(8) =12a(9) =20a(10) =70a(11) =40a(12) =36a(13) =40a(14) =70a(15) =252a(16) =140a(17) =120a(18) =120a(19) =140a(20) =252a(21) =924a(22) =504a(23) =420a(24) =400a(25) =420a(26) =504a(27) =924a(28) =3432a(29) =1848
External references
- oeis: A067804