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, 1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148480
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, 1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =71a(6) =281a(7) =1123a(8) =4752a(9) =20252a(10) =88984a(11) =393523a(12) =1772005a(13) =8023052a(14) =36748575a(15) =169092971a(16) =784207581a(17) =3650862063a(18) =17092352795a(19) =80278975116a(20) =378632852454
External references
- oeis: A148480