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), (0, -1, 0), (0, 0, -1), (1, 1, 0)}.
A149171
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), (0, -1, 0), (0, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =33a(5) =115a(6) =391a(7) =1439a(8) =5405a(9) =20303a(10) =79050a(11) =311520a(12) =1230961a(13) =4964657a(14) =20189652a(15) =82314358a(16) =340130593a(17) =1413947795a(18) =5890309480a(19) =24773921096a(20) =104674234969a(21) =443030309859
External references
- oeis: A149171