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, 1, -1), (0, 0, 1), (1, -1, 0), (1, 0, -1)}.
A148020
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, 1, -1), (0, 0, 1), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =17a(6) =46a(7) =127a(8) =375a(9) =1128a(10) =3367a(11) =10920a(12) =34671a(13) =112564a(14) =378464a(15) =1276401a(16) =4367446a(17) =15059481a(18) =53064595a(19) =187243903a(20) =663669380a(21) =2400056392a(22) =8678448201a(23) =31543452428a(24) =115945737265a(25) =428333746174
External references
- oeis: A148020