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, 0), (0, 0, 1), (0, 1, 1), (1, 1, -1)}.
A150043
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, 0), (0, 0, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =60a(5) =204a(6) =716a(7) =2560a(8) =9296a(9) =34128a(10) =126560a(11) =472864a(12) =1778016a(13) =6722880a(14) =25536768a(15) =97384128a(16) =372691968a(17) =1430618112a(18) =5506231808a(19) =21244025088a(20) =82137286400a(21) =318177976064
External references
- oeis: A150043