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, 0, 0), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
A148789
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, 0, 0), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =25a(5) =77a(6) =252a(7) =848a(8) =2894a(9) =10064a(10) =35290a(11) =125487a(12) =450179a(13) =1626087a(14) =5916476a(15) =21633851a(16) =79579418a(17) =294022842a(18) =1090624361a(19) =4061006824a(20) =15168490711a(21) =56843270546a(22) =213593833242a(23) =804616157278
External references
- oeis: A148789