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, -1, 0), (1, 0, 1), (1, 1, -1)}.
A148790
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, -1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =25a(5) =77a(6) =257a(7) =853a(8) =2946a(9) =10178a(10) =36005a(11) =127635a(12) =459307a(13) =1657395a(14) =6042087a(15) =22089132a(16) =81346477a(17) =300383933a(18) =1115251580a(19) =4151032922a(20) =15515158110a(21) =58122268630a(22) =218459019113a(23) =822782085889
External references
- oeis: A148790