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), (1, -1, 1), (1, 1, -1), (1, 1, 0)}.
A148966
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), (1, -1, 1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =31a(5) =107a(6) =396a(7) =1458a(8) =5540a(9) =21033a(10) =81293a(11) =314027a(12) =1225435a(13) =4783122a(14) =18789381a(15) =73832583a(16) =291304767a(17) =1149836260a(18) =4551057689a(19) =18020509287a(20) =71487440526a(21) =283703124753
External references
- oeis: A148966