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, 1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148491
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, 1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =79a(6) =308a(7) =1230a(8) =5122a(9) =21917a(10) =95429a(11) =420388a(12) =1874468a(13) =8451916a(14) =38469785a(15) =176364014a(16) =813412342a(17) =3772468146a(18) =17586034802a(19) =82346756679a(20) =387060294933
External references
- oeis: A148491