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, 0, 0)}.
A149857
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, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =38a(5) =116a(6) =373a(7) =1212a(8) =4063a(9) =13790a(10) =47820a(11) =166683a(12) =589544a(13) =2096696a(14) =7543287a(15) =27220425a(16) =99068066a(17) =361665420a(18) =1329801449a(19) =4899090442a(20) =18150085724a(21) =67373439992a(22) =251310896362a(23) =938695649224
External references
- oeis: A149857