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, 0), (1, 1, -1), (1, 1, 1)}.
A149433
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, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =46a(5) =160a(6) =590a(7) =2165a(8) =8150a(9) =30606a(10) =116538a(11) =443508a(12) =1702458a(13) =6538806a(14) =25255218a(15) =97606497a(16) =378655122a(17) =1470166114a(18) =5723589574a(19) =22300607746a(20) =87061280866a(21) =340147775826
External references
- oeis: A149433