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), (-1, 0, 1), (0, -1, 1), (0, 0, -1), (1, 1, 1)}.
A149669
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), (-1, 0, 1), (0, -1, 1), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =63a(5) =253a(6) =1033a(7) =4255a(8) =17935a(9) =76417a(10) =328111a(11) =1422019a(12) =6205767a(13) =27220843a(14) =120065915a(15) =531976191a(16) =2365738953a(17) =10559780719a(18) =47286444233a(19) =212333994419a(20) =956041766143
External references
- oeis: A149669