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, 0, 1), (1, 1, 0)}.
A150065
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, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =64a(5) =210a(6) =762a(7) =2664a(8) =9948a(9) =35550a(10) =134096a(11) =490758a(12) =1871274a(13) =6920776a(14) =26536824a(15) =99336688a(16) =383085288a(17) =1442993348a(18) =5583944754a(19) =21186604016a(20) =82280182330a(21) =313474831586
External references
- oeis: A150065