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, 0), (-1, 0, 1), (0, -1, 0), (1, 0, 0), (1, 1, -1)}.
A148616
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, 0), (-1, 0, 1), (0, -1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =58a(6) =214a(7) =710a(8) =2688a(9) =9935a(10) =38635a(11) =151986a(12) =608873a(13) =2484076a(14) =10237368a(15) =42773905a(16) =180478226a(17) =768102528a(18) =3300273601a(19) =14267425390a(20) =62167686036a(21) =272375280535
External references
- oeis: A148616