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, 0, 1), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
A148764
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, 0, 1), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =29a(5) =86a(6) =392a(7) =1322a(8) =6249a(9) =22745a(10) =109606a(11) =419196a(12) =2043884a(13) =8092458a(14) =39753029a(15) =161472509a(16) =797144627a(17) =3302056398a(18) =16356479185a(19) =68812280569a(20) =341665216537
External references
- oeis: A148764