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), (0, 0, -1), (1, -1, 1), (1, 0, 1)}.
A148821
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), (0, 0, -1), (1, -1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =92a(6) =327a(7) =1193a(8) =4562a(9) =17685a(10) =69588a(11) =279436a(12) =1133916a(13) =4641173a(14) =19219142a(15) =80216046a(16) =336914408a(17) =1425417925a(18) =6066920841a(19) =25945712001a(20) =111518261524a(21) =481520271363
External references
- oeis: A148821