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, -1), (0, 0, 1), (0, 1, 1), (1, -1, -1)}.
A149870
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, -1), (0, 0, 1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =42a(5) =138a(6) =482a(7) =1674a(8) =6193a(9) =22905a(10) =87142a(11) =331804a(12) =1297850a(13) =5080751a(14) =20167345a(15) =80358260a(16) =324330890a(17) =1312019214a(18) =5346985706a(19) =21886646737a(20) =90188575104a(21) =372646373051
External references
- oeis: A149870