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, 0), (-1, 1, 1), (1, 0, -1), (1, 0, 1)}.
A148765
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, 0), (-1, 1, 1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =29a(5) =89a(6) =353a(7) =1163a(8) =5035a(9) =18355a(10) =77621a(11) =287757a(12) =1277101a(13) =4987779a(14) =21789935a(15) =85442629a(16) =385694431a(17) =1563101755a(18) =6967441627a(19) =28231536045a(20) =128944096445a(21) =535005933021
External references
- oeis: A148765