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, -1, 0), (-1, 0, 1), (0, 1, 0), (1, -1, 0)}.
A148120
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, -1, 0), (-1, 0, 1), (0, 1, 0), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =26a(6) =70a(7) =211a(8) =609a(9) =1814a(10) =5585a(11) =18299a(12) =56629a(13) =183710a(14) =614290a(15) =2045138a(16) =6747534a(17) =22935233a(18) =79485661a(19) =269357929a(20) =927805574a(21) =3254223114a(22) =11419446321a(23) =39663546846a(24) =140361238869a(25) =501455796320
External references
- oeis: A148120