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, 1), (-1, 0, 1), (1, 0, 0), (1, 1, -1)}.
A148139
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, 1), (-1, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =28a(6) =95a(7) =281a(8) =1023a(9) =3303a(10) =12548a(11) =42915a(12) =169376a(13) =603821a(14) =2451317a(15) =9026835a(16) =37375225a(17) =141235599a(18) =593917404a(19) =2291130138a(20) =9761555193a(21) =38299976245a(22) =164959896704a(23) =656575126112
External references
- oeis: A148139