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, 1, -1), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.
A148810
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, 1, -1), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =86a(6) =305a(7) =1104a(8) =4127a(9) =15865a(10) =61291a(11) =242393a(12) =972891a(13) =3914605a(14) =15992813a(15) =66039145a(16) =272797057a(17) =1139731760a(18) =4799616692a(19) =20201380611a(20) =85786198770a(21) =366534573684
External references
- oeis: A148810