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, 0), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148463
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, 0), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =18a(5) =63a(6) =238a(7) =921a(8) =3724a(9) =15481a(10) =65567a(11) =282538a(12) =1236274a(13) =5472661a(14) =24462349a(15) =110348896a(16) =501604455a(17) =2294792044a(18) =10560615629a(19) =48858061607a(20) =227074658274
External references
- oeis: A148463