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, 0, 0), (1, 1, -1)}.
A148397
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, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =53a(6) =201a(7) =735a(8) =2865a(9) =11311a(10) =45866a(11) =189465a(12) =796172a(13) =3381641a(14) =14561199a(15) =63187193a(16) =276872754a(17) =1222044791a(18) =5430760602a(19) =24286138255a(20) =109201747174a(21) =493481357555
External references
- oeis: A148397