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, -1, 0), (1, 0, 1)}.
A148217
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, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =31a(6) =94a(7) =268a(8) =906a(9) =2645a(10) =9225a(11) =28776a(12) =101860a(13) =328801a(14) =1199161a(15) =3945314a(16) =14549121a(17) =49291423a(18) =183638359a(19) =630444147a(20) =2382579687a(21) =8298042269a(22) =31507588001a(23) =111374062343a(24) =426481479380
External references
- oeis: A148217