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), (0, 0, 1), (0, 1, 0), (1, 0, 0)}.
A151029
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), (0, 0, 1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =27a(4) =87a(5) =297a(6) =1041a(7) =3663a(8) =13083a(9) =47523a(10) =174519a(11) =642645a(12) =2381481a(13) =8893413a(14) =33402909a(15) =125690943a(16) =474623079a(17) =1800053415a(18) =6850772907a(19) =26107259823a(20) =99713862171a(21) =381909000663
External references
- oeis: A151029