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, 0), (0, 1, 1), (1, -1, -1)}.
A148220
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, 0), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =31a(6) =94a(7) =288a(8) =926a(9) =2825a(10) =9745a(11) =32052a(12) =109138a(13) =371320a(14) =1327340a(15) =4545571a(16) =16347289a(17) =58255074a(18) =211009754a(19) =754764293a(20) =2796072544a(21) =10146730943a(22) =37543834436a(23) =138460496239a(24) =518503084778
External references
- oeis: A148220