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, 0, 1), (1, 0, -1), (1, 1, 0)}.
A148713
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, 0, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =24a(5) =67a(6) =245a(7) =758a(8) =2844a(9) =9351a(10) =35637a(11) =121842a(12) =469242a(13) =1648373a(14) =6394548a(15) =22913355a(16) =89351915a(17) =325041804a(18) =1272438056a(19) =4683780808a(20) =18390175132a(21) =68334783088a(22) =268934563467
External references
- oeis: A148713