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, 0), (1, -1, -1), (1, 1, 1)}.
A149508
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, 0), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =47a(5) =155a(6) =567a(7) =2221a(8) =8317a(9) =32641a(10) =130645a(11) =512301a(12) =2088841a(13) =8448001a(14) =34267705a(15) =141725419a(16) =581403191a(17) =2405519927a(18) =10036856947a(19) =41688954635a(20) =174672387397a(21) =733626444877
External references
- oeis: A149508