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, 0, 1), (1, -1, -1), (1, 1, -1)}.
A148226
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, 0, 1), (1, -1, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =31a(6) =99a(7) =301a(8) =1027a(9) =3231a(10) =11284a(11) =39376a(12) =138731a(13) =489955a(14) =1797810a(15) =6590166a(16) =24181127a(17) =90210217a(18) =341039892a(19) =1285487504a(20) =4878883689a(21) =18749626333a(22) =72233814243a(23) =278434319785
External references
- oeis: A148226