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, 1, 1), (1, 0, -1)}.
A148290
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, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =13a(5) =34a(6) =102a(7) =304a(8) =925a(9) =2930a(10) =9356a(11) =30311a(12) =99822a(13) =331596a(14) =1112254a(15) =3760716a(16) =12814621a(17) =43943067a(18) =151483760a(19) =525294768a(20) =1829733893a(21) =6399076740a(22) =22474998817a(23) =79217132995a(24) =280099122391a(25) =993531937083
External references
- oeis: A148290