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, 0), (1, -1, 0), (1, 0, 1), (1, 1, -1)}.
A148974
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, 0), (1, -1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =107a(6) =406a(7) =1515a(8) =6056a(9) =23845a(10) =98122a(11) =399886a(12) =1682244a(13) =7032741a(14) =30086609a(15) =128154473a(16) =555416535a(17) =2399938654a(18) =10510610675a(19) =45938255055a(20) =202930811756a(21) =895234875377
External references
- oeis: A148974