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, 0), (0, 1, -1), (1, -1, 1), (1, 0, 0)}.
A148250
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, 0), (0, 1, -1), (1, -1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =36a(6) =123a(7) =412a(8) =1504a(9) =5600a(10) =21399a(11) =84082a(12) =335325a(13) =1365925a(14) =5631945a(15) =23526240a(16) =99401707a(17) =423998705a(18) =1825605301a(19) =7920044895a(20) =34608734002a(21) =152221362735a(22) =673469046190
External references
- oeis: A148250