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), (1, -1, 1), (1, 1, 0)}.
A148633
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), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =22a(5) =57a(6) =215a(7) =629a(8) =2420a(9) =7581a(10) =29531a(11) =96760a(12) =379652a(13) =1283811a(14) =5061781a(15) =17519154a(16) =69310177a(17) =244190879a(18) =968446829a(19) =3460113143a(20) =13747403013a(21) =49675283322a(22) =197634030863a(23) =720800912189
External references
- oeis: A148633