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, 0), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
A148197
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, 0), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =33a(6) =107a(7) =338a(8) =1180a(9) =4076a(10) =14842a(11) =54278a(12) =204905a(13) =779173a(14) =3021664a(15) =11825850a(16) =46902050a(17) =187562192a(18) =757472538a(19) =3082083587a(20) =12636064926a(21) =52138079196a(22) =216474788462a(23) =903754670864
External references
- oeis: A148197