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), (0, 1, 0), (1, 1, -1), (1, 1, 0)}.
A150172
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), (0, 1, 0), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =76a(5) =300a(6) =1240a(7) =5248a(8) =22756a(9) =100284a(10) =448560a(11) =2029136a(12) =9270932a(13) =42703340a(14) =198101040a(15) =924561552a(16) =4338029924a(17) =20448459100a(18) =96785899376a(19) =459773170064
External references
- oeis: A150172