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, 1), (-1, 1, 1), (0, 0, 1), (1, 0, -1)}.
A148319
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, 1), (-1, 1, 1), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =39a(6) =126a(7) =396a(8) =1362a(9) =4639a(10) =16619a(11) =59519a(12) =220100a(13) =815414a(14) =3090682a(15) =11738378a(16) =45353386a(17) =175598040a(18) =688854841a(19) =2708282490a(20) =10756657528a(21) =42820338694a(22) =171830989992a(23) =691099456497
External references
- oeis: A148319