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, -1, 1), (-1, 1, -1), (1, 0, 0), (1, 0, 1)}.
A149872
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, -1, 1), (-1, 1, -1), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =42a(5) =138a(6) =491a(7) =1691a(8) =6506a(9) =24158a(10) =95110a(11) =359634a(12) =1476071a(13) =5814658a(14) =24038501a(15) =95389250a(16) =405330287a(17) =1652139456a(18) =7033071180a(19) =28753343889a(20) =124893383967a(21) =520653084842
External references
- oeis: A149872