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), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
A150547
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), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =105a(5) =426a(6) =1823a(7) =7779a(8) =34008a(9) =149349a(10) =663184a(11) =2958204a(12) =13294636a(13) =59928609a(14) =271617284a(15) =1234268264a(16) =5629752155a(17) =25739993324a(18) =118012906757a(19) =542163615314
External references
- oeis: A150547