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, 0, 1), (1, -1, -1), (1, 0, -1), (1, 1, 1)}.
A149626
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, 0, 1), (1, -1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =67a(5) =247a(6) =1115a(7) =4489a(8) =20413a(9) =86161a(10) =393981a(11) =1711377a(12) =7860333a(13) =34797749a(14) =160412561a(15) =719666043a(16) =3327831031a(17) =15076408631a(18) =69900784059a(19) =319040043727
External references
- oeis: A149626