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), (-1, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149228
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), (-1, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =46a(5) =146a(6) =696a(7) =2472a(8) =12001a(9) =45483a(10) =223022a(11) =881542a(12) =4348583a(13) =17699412a(14) =87646682a(15) =364484570a(16) =1809577040a(17) =7649804945a(18) =38047511026a(19) =162936769267a(20) =811426736660
External references
- oeis: A149228