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, 0, 0), (-1, 1, 0), (1, -1, -1), (1, 1, 1)}.
A149553
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, 0, 0), (-1, 1, 0), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =59a(5) =187a(6) =883a(7) =3169a(8) =14891a(9) =55903a(10) =267807a(11) =1054621a(12) =5047767a(13) =20267863a(14) =98066381a(15) =404145263a(16) =1954385933a(17) =8141815955a(18) =39645732343a(19) =167944424539a(20) =817364759403
External references
- oeis: A149553