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, 0, 0), (1, 0, 1), (1, 1, 0)}.
A151162
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, 0, 0), (1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =3a(2) =12a(3) =45a(4) =180a(5) =702a(6) =2808a(7) =11097a(8) =44388a(9) =176418a(10) =705672a(11) =2812482a(12) =11249928a(13) =44903484a(14) =179613936a(15) =717517521a(16) =2870070084a(17) =11470898106a(18) =45883592424a(19) =183438670950a(20) =733754683800
External references
- oeis: A151162