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), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
A148806
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), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =84a(6) =305a(7) =1086a(8) =4078a(9) =15461a(10) =60478a(11) =236475a(12) =944909a(13) =3810840a(14) =15527946a(15) =63575099a(16) =263179621a(17) =1096167860a(18) =4587850961a(19) =19302087093a(20) =81731578479a(21) =347390982785
External references
- oeis: A148806