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, -1, 1), (-1, 1, -1), (1, -1, -1), (1, 1, 1)}.
A149499
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, -1, 1), (-1, 1, -1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =9a(4) =45a(5) =109a(6) =545a(7) =1553a(8) =7765a(9) =24117a(10) =120585a(11) =396969a(12) =1984845a(13) =6813153a(14) =34065765a(15) =120666321a(16) =603331605a(17) =2190578173a(18) =10952890865a(19) =40569468449a(20) =202847342245a(21) =763846716897
External references
- oeis: A149499