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), (-1, 1, 0), (0, 0, -1), (1, 0, 1)}.
A149240
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), (-1, 1, 0), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =36a(5) =125a(6) =451a(7) =1627a(8) =6114a(9) =23313a(10) =89669a(11) =349271a(12) =1377492a(13) =5467197a(14) =21844772a(15) =87937757a(16) =355984774a(17) =1447373061a(18) =5912845467a(19) =24259828873a(20) =99881034250a(21) =412575338505
External references
- oeis: A149240