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, 0, 0), (1, 1, -1)}.
A148136
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, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =28a(6) =89a(7) =258a(8) =875a(9) =2736a(10) =9651a(11) =31721a(12) =114934a(13) =391219a(14) =1444642a(15) =5045155a(16) =18889869a(17) =67267567a(18) =254499953a(19) =920173993a(20) =3509555190a(21) =12844126821a(22) =49300579903a(23) =182216041272a(24) =703004670539
External references
- oeis: A148136