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, 1), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
A148694
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, 1), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =67a(6) =237a(7) =805a(8) =2885a(9) =10509a(10) =39807a(11) =149141a(12) =579341a(13) =2263291a(14) =8905423a(15) =35534405a(16) =143264965a(17) =578222653a(18) =2363626881a(19) =9716589785a(20) =40034773345a(21) =166371602771a(22) =694827197783
External references
- oeis: A148694