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), (0, 1, -1), (1, 0, 1)}.
A148956
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), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =104a(6) =379a(7) =1437a(8) =5497a(9) =21237a(10) =84414a(11) =337434a(12) =1350955a(13) =5488288a(14) =22477310a(15) =92056160a(16) =379557876a(17) =1576415883a(18) =6555545218a(19) =27337486848a(20) =114605627815a(21) =481547395405
External references
- oeis: A148956