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, 1, 0), (0, 0, -1), (0, 1, 1), (1, 0, 0)}.
A150173
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, 1, 0), (0, 0, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =77a(5) =288a(6) =1154a(7) =4629a(8) =19430a(9) =80553a(10) =344561a(11) =1466736a(12) =6394069a(13) =27657644a(14) =121879990a(15) =534480899a(16) =2379888298a(17) =10536644015a(18) =47245113964a(19) =210938882127a(20) =952083417273
External references
- oeis: A150173