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, 0), (-1, 0, 1), (1, -1, 0), (1, 0, 0), (1, 1, -1)}.
A148617
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, 0), (-1, 0, 1), (1, -1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =58a(6) =222a(7) =724a(8) =2920a(9) =10477a(10) =43806a(11) =167427a(12) =718675a(13) =2872493a(14) =12577258a(15) =51963651a(16) =231079431a(17) =979298120a(18) =4409345740a(19) =19064971826a(20) =86718435679a(21) =381062416397
External references
- oeis: A148617