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, -1), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148632
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, -1), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =22a(5) =57a(6) =199a(7) =635a(8) =2267a(9) =7697a(10) =28005a(11) =102183a(12) =376924a(13) =1400719a(14) =5332589a(15) =20300989a(16) =77782887a(17) =301584310a(18) =1177868933a(19) =4605656965a(20) =18140074145a(21) =71985896850a(22) =286147136610
External references
- oeis: A148632