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), (0, 0, -1), (0, 0, 1), (1, 0, -1)}.
A148579
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), (0, 0, -1), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =51a(6) =184a(7) =552a(8) =2112a(9) =7007a(10) =27770a(11) =97954a(12) =397618a(13) =1465253a(14) =6064186a(15) =23118215a(16) =97170678a(17) =380318302a(18) =1618291003a(19) =6467714046a(20) =27801600440a(21) =113039060164a(22) =490098103728
External references
- oeis: A148579