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, 0), (1, 0, -1), (1, 0, 0)}.
A148634
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, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =22a(5) =57a(6) =228a(7) =675a(8) =2843a(9) =9166a(10) =39921a(11) =136593a(12) =608999a(13) =2177271a(14) =9875969a(15) =36522316a(16) =167856514a(17) =637648645a(18) =2961102120a(19) =11497232435a(20) =53836918512a(21) =212865555852
External references
- oeis: A148634