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, 1), (-1, 1, 0), (0, 1, -1), (1, 0, 1)}.
A148778
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, 1), (-1, 1, 0), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =23a(5) =75a(6) =242a(7) =797a(8) =2722a(9) =9358a(10) =32361a(11) =113558a(12) =401386a(13) =1423419a(14) =5080996a(15) =18236262a(16) =65633113a(17) =237023257a(18) =859125261a(19) =3121571670a(20) =11366570789a(21) =41490482518a(22) =151752532780a(23) =555940056833
External references
- oeis: A148778