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), (-1, 1, 1), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
A148984
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), (-1, 1, 1), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =112a(6) =431a(7) =1678a(8) =6763a(9) =27670a(10) =115426a(11) =487077a(12) =2082049a(13) =8977804a(14) =39046114a(15) =171030912a(16) =753916676a(17) =3341768584a(18) =14885951812a(19) =66601109529a(20) =299166820070
External references
- oeis: A148984