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, 0), (-1, 1, -1), (0, 0, 1), (1, 0, 0)}.
A149909
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, 0), (-1, 1, -1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =45a(5) =148a(6) =502a(7) =1761a(8) =6373a(9) =23450a(10) =88117a(11) =335242a(12) =1292846a(13) =5036660a(14) =19805692a(15) =78519646a(16) =313475920a(17) =1259607337a(18) =5089549367a(19) =20671116524a(20) =84337924172a(21) =345545297075
External references
- oeis: A149909