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, 0, 1), (0, 1, -1), (1, -1, 0), (1, 1, 0)}.
A149372
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, 0, 1), (0, 1, -1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =46a(5) =163a(6) =664a(7) =2674a(8) =11203a(9) =47344a(10) =204884a(11) =896034a(12) =3961142a(13) =17675669a(14) =79602985a(15) =360846935a(16) =1645807487a(17) =7549642897a(18) =34808756325a(19) =161175927217a(20) =749252331727
External references
- oeis: A149372