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, 0, 0), (-1, 0, 1), (0, -1, 0), (1, 1, -1), (1, 1, 0)}.
A149340
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, 0, 0), (-1, 0, 1), (0, -1, 0), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =40a(5) =154a(6) =590a(7) =2291a(8) =9523a(9) =39351a(10) =164720a(11) =711336a(12) =3073150a(13) =13376333a(14) =59305585a(15) =263251753a(16) =1174914851a(17) =5305026397a(18) =23991323059a(19) =108935348192a(20) =498558014381
External references
- oeis: A149340