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, 1, 0)}.
A148699
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, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =69a(6) =229a(7) =721a(8) =2541a(9) =8240a(10) =29393a(11) =98714a(12) =355194a(13) =1216839a(14) =4415474a(15) =15380589a(16) =56058177a(17) =197157783a(18) =723355013a(19) =2565493440a(20) =9440747457a(21) =33741764503a(22) =124548794972a(23) =447786779945
External references
- oeis: A148699