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, 1, -1), (1, 0, -1), (1, 1, -1)}.
A149107
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, 1, -1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =8a(4) =34a(5) =91a(6) =409a(7) =1253a(8) =5796a(9) =19316a(10) =91012a(11) =321297a(12) =1532547a(13) =5642190a(14) =27148463a(15) =103193047a(16) =499754109a(17) =1947944739a(18) =9480548621a(19) =37710917710a(20) =184252596026a(21) =745269843131
External references
- oeis: A149107