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), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148477
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), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =67a(6) =253a(7) =957a(8) =3841a(9) =15474a(10) =64472a(11) =269779a(12) =1152812a(13) =4946845a(14) =21526634a(15) =94037657a(16) =414827211a(17) =1836302134a(18) =8186401788a(19) =36608956495a(20) =164582568876a(21) =741942696193
External references
- oeis: A148477