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, 0), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
A148562
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, 0), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =18a(5) =51a(6) =155a(7) =506a(8) =1627a(9) =5553a(10) =19155a(11) =66805a(12) =240211a(13) =863960a(14) =3165182a(15) =11733955a(16) =43652243a(17) =164830834a(18) =624894684a(19) =2385717893a(20) =9190397204a(21) =35493497563a(22) =138120244600a(23) =539990789121
External references
- oeis: A148562