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), (1, 1, 1)}.
A149077
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), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =7a(4) =28a(5) =70a(6) =244a(7) =751a(8) =2356a(9) =8122a(10) =25684a(11) =89506a(12) =297424a(13) =1000768a(14) =3500152a(15) =11753635a(16) =41555116a(17) =142721506a(18) =494942476a(19) =1752770218a(20) =6058733488a(21) =21640017244a(22) =75771413032a(23) =267205134886a(24) =955330818784
External references
- oeis: A149077