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), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
A150226
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), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =86a(5) =318a(6) =1349a(7) =5654a(8) =23674a(9) =102512a(10) =451457a(11) =1952965a(12) =8704458a(13) =38982187a(14) =172994207a(15) =781645957a(16) =3548152605a(17) =15981222319a(18) =72960968130a(19) =334143804197
External references
- oeis: A150226