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), (1, 1, -1), (1, 1, 1)}.
A149445
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), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =48a(5) =174a(6) =664a(7) =2511a(8) =9704a(9) =37446a(10) =146328a(11) =571254a(12) =2245680a(13) =8828364a(14) =34861968a(15) =137681413a(16) =545275968a(17) =2160151774a(18) =8574035128a(19) =34041458854a(20) =135331020496a(21) =538160983688
External references
- oeis: A149445