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), (0, -1, 1), (1, 0, -1), (1, 1, 1)}.
A149429
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), (0, -1, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =44a(5) =156a(6) =560a(7) =2065a(8) =7702a(9) =28898a(10) =109382a(11) =415768a(12) =1589470a(13) =6102378a(14) =23500260a(15) =90781393a(16) =351496758a(17) =1364024040a(18) =5303511032a(19) =20655297846a(20) =80569251748a(21) =314690828550
External references
- oeis: A149429