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, 0), (-1, 0, -1), (-1, 0, 0), (1, -1, -1), (1, 1, 1)}.
A149518
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, 0), (-1, 0, -1), (-1, 0, 0), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =49a(5) =157a(6) =669a(7) =2359a(8) =10469a(9) =38031a(10) =171947a(11) =654365a(12) =2963317a(13) =11615139a(14) =53048663a(15) =211305971a(16) =971575373a(17) =3937700723a(18) =18158329543a(19) =74598316371a(20) =345340823051
External references
- oeis: A149518