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), (1, -1, 1), (1, 0, -1), (1, 0, 0)}.
A148251
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), (1, -1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =36a(6) =124a(7) =397a(8) =1485a(9) =5181a(10) =20291a(11) =75144a(12) =303886a(13) =1173749a(14) =4865351a(15) =19393235a(16) =81893553a(17) =334492176a(18) =1433581525a(19) =5969863058a(20) =25895103318a(21) =109543497246a(22) =479893948780
External references
- oeis: A148251