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, -1), (-1, -1, 0), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
A148268
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, -1), (-1, -1, 0), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =15a(5) =39a(6) =141a(7) =405a(8) =1625a(9) =5072a(10) =20768a(11) =67847a(12) =283581a(13) =960454a(14) =4103227a(15) =14299276a(16) =61536178a(17) =218928715a(18) =954116544a(19) =3457761163a(20) =15171016922a(21) =55779720193a(22) =246281871482a(23) =916913223574
External references
- oeis: A148268