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), (-1, 0, 0), (-1, 1, -1), (0, 1, 1), (1, -1, 0)}.
A148345
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), (-1, 0, 0), (-1, 1, -1), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =39a(6) =127a(7) =405a(8) =1330a(9) =4478a(10) =15574a(11) =54337a(12) =194625a(13) =700396a(14) =2559981a(15) =9426329a(16) =35084696a(17) =131480551a(18) =496179720a(19) =1884859504a(20) =7203732487a(21) =27668398667a(22) =106846816154a(23) =414250796495
External references
- oeis: A148345