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, -1), (1, 0, 0), (1, 1, -1)}.
A148350
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, -1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =42a(6) =141a(7) =454a(8) =1636a(9) =5654a(10) =21372a(11) =77839a(12) =304105a(13) =1149623a(14) =4605049a(15) =17911778a(16) =73142360a(17) =290931536a(18) =1206443012a(19) =4886121626a(20) =20518294930a(21) =84344339293a(22) =357919513388
External references
- oeis: A148350