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), (0, 0, -1), (0, 0, 1), (0, 1, 1), (1, 1, 1)}.
A151213
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), (0, 0, -1), (0, 0, 1), (0, 1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =55a(4) =251a(5) =1141a(6) =5335a(7) =24963a(8) =118375a(9) =562375a(10) =2691437a(11) =12906257a(12) =62168991a(13) =300007995a(14) =1452102449a(15) =7039558679a(16) =34199832655a(17) =166374726507a(18) =810680032585
External references
- oeis: A151213