Number of walks on cubic lattice starting and finishing on the xy plane and never going below it.
A005572
Number of walks on cubic lattice starting and finishing on the xy plane and never going below it.
Terms
- a(0) =1a(1) =4a(2) =17a(3) =76a(4) =354a(5) =1704a(6) =8421a(7) =42508a(8) =218318a(9) =1137400a(10) =5996938a(11) =31940792a(12) =171605956a(13) =928931280a(14) =5061593709a(15) =27739833228a(16) =152809506582a(17) =845646470616
External references
- oeis: A005572