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, 1, 0), (1, 0, 1)}.
A149837
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, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =36a(5) =100a(6) =324a(7) =1052a(8) =3228a(9) =10852a(10) =36532a(11) =117676a(12) =404364a(13) =1390516a(14) =4610980a(15) =16077660a(16) =56078812a(17) =189603652a(18) =668095892a(19) =2354323852a(20) =8071935148a(21) =28669742292a(22) =101819683204a(23) =352800887100
External references
- oeis: A149837