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, 1, -1), (1, 0, -1), (1, 1, 0)}.
A148951
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, 1, -1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =102a(6) =397a(7) =1500a(8) =6009a(9) =24451a(10) =101183a(11) =425673a(12) =1816275a(13) =7816634a(14) =34052901a(15) =149363641a(16) =660504469a(17) =2940315586a(18) =13164619889a(19) =59271046961a(20) =268144561326
External references
- oeis: A148951