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), (-1, 1, 1), (1, 0, -1), (1, 1, 1)}.
A149638
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), (-1, 1, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =69a(5) =233a(6) =1129a(7) =4199a(8) =20577a(9) =80079a(10) =394393a(11) =1591283a(12) =7865009a(13) =32469373a(14) =160943861a(15) =676492039a(16) =3358984785a(17) =14317463163a(18) =71179956577a(19) =306812030707
External references
- oeis: A149638