Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 0), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
A150174
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 0), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =77a(5) =288a(6) =1170a(7) =4696a(8) =19695a(9) =81837a(10) =351839a(11) =1497206a(12) =6532389a(13) =28288671a(14) =124889220a(15) =547619885a(16) =2439954073a(17) =10806293943a(18) =48494512986a(19) =216496177713a(20) =977425315497
External references
- oeis: A150174