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, 0, -1), (1, 0, -1), (1, 1, 0)}.
A148683
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, 0, -1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =22a(5) =66a(6) =227a(7) =758a(8) =2741a(9) =9861a(10) =36917a(11) =138933a(12) =535499a(13) =2077759a(14) =8190950a(15) =32516955a(16) =130479483a(17) =527198671a(18) =2147012696a(19) =8795672388a(20) =36264715700a(21) =150285288597a(22) =626008650470
External references
- oeis: A148683