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), (0, 0, -1), (1, 0, 0)}.
A148014
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), (0, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =17a(6) =46a(7) =110a(8) =307a(9) =848a(10) =2420a(11) =6962a(12) =20273a(13) =61162a(14) =185870a(15) =568890a(16) =1757412a(17) =5477941a(18) =17377747a(19) =55272016a(20) =176736009a(21) =568644124a(22) =1842453512a(23) =6025347906a(24) =19741386691a(25) =64938905399a(26) =214606827546a(27) =712767674928
External references
- oeis: A148014