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, 1), (-1, 0, 1), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.
A148205
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, 1), (-1, 0, 1), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =35a(6) =117a(7) =411a(8) =1506a(9) =5704a(10) =22264a(11) =89210a(12) =364866a(13) =1519775a(14) =6428590a(15) =27566348a(16) =119608685a(17) =524401151a(18) =2320439335a(19) =10352516502a(20) =46528515117a(21) =210506616379a(22) =958095048741
External references
- oeis: A148205