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), (0, 1, 1), (1, 0, -1)}.
A148308
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), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =37a(6) =116a(7) =346a(8) =1112a(9) =3541a(10) =11718a(11) =38574a(12) =130865a(13) =440660a(14) =1519793a(15) =5214004a(16) =18188974a(17) =63305611a(18) =222942065a(19) =784291208a(20) =2784447158a(21) =9878585955a(22) =35305415420a(23) =126140847292a(24) =453298218308
External references
- oeis: A148308