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), (-1, 1, -1), (1, 0, 1), (1, 1, -1)}.
A148746
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), (-1, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =27a(5) =83a(6) =335a(7) =1176a(8) =4852a(9) =18289a(10) =78155a(11) =307096a(12) =1344644a(13) =5444241a(14) =24233783a(15) =100316804a(16) =452807044a(17) =1905770780a(18) =8702111718a(19) =37112086751a(20) =171025658627a(21) =737345572047
External references
- oeis: A148746