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, 0), (-1, 0, 1), (-1, 1, -1), (0, 1, 1), (1, -1, -1)}.
A148221
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, 0), (-1, 0, 1), (-1, 1, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =31a(6) =94a(7) =288a(8) =926a(9) =2877a(10) =9891a(11) =33305a(12) =114060a(13) =398440a(14) =1416214a(15) =5011681a(16) =18123463a(17) =65923411a(18) =241065146a(19) =890520980a(20) =3316802411a(21) =12381311497a(22) =46575028978a(23) =176069708511a(24) =667781099894
External references
- oeis: A148221