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, 0, 1), (0, 0, 1), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.
A150220
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, 0, 1), (0, 0, 1), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =82a(5) =339a(6) =1461a(7) =6482a(8) =29384a(9) =135426a(10) =632225a(11) =2981872a(12) =14180688a(13) =67895415a(14) =326899704a(15) =1581320373a(16) =7679588620a(17) =37420701756a(18) =182865431382a(19) =895826999202
External references
- oeis: A150220