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, 1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
A148831
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, 1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =88a(6) =309a(7) =1081a(8) =3925a(9) =14238a(10) =52786a(11) =195861a(12) =736210a(13) =2772008a(14) =10526439a(15) =40035856a(16) =153181152a(17) =586992985a(18) =2258768052a(19) =8704799117a(20) =33650052792a(21) =130249984973a(22) =505360173122
External references
- oeis: A148831