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, 0, -1), (1, -1, 1), (1, 1, 0)}.
A149369
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, 0, -1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =45a(5) =171a(6) =687a(7) =2803a(8) =11748a(9) =49831a(10) =214434a(11) =931716a(12) =4085156a(13) =18040522a(14) =80183435a(15) =358314337a(16) =1608920279a(17) =7254733913a(18) =32835218026a(19) =149109378700a(20) =679164584418
External references
- oeis: A149369