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, 0, 0), (-1, 1, 1), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.
A148476
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, 0, 0), (-1, 1, 1), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =67a(6) =238a(7) =889a(8) =3430a(9) =13502a(10) =54133a(11) =220602a(12) =912169a(13) =3814549a(14) =16105873a(15) =68586793a(16) =294388261a(17) =1272134186a(18) =5530081563a(19) =24168691099a(20) =106150861556a(21) =468293726986
External references
- oeis: A148476