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, 0), (-1, 0, 1), (-1, 1, 0), (0, 0, -1), (1, 0, 0)}.
A148580
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, 0), (-1, 0, 1), (-1, 1, 0), (0, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =52a(6) =175a(7) =538a(8) =1835a(9) =6128a(10) =21452a(11) =75459a(12) =270156a(13) =979587a(14) =3595733a(15) =13307639a(16) =49732088a(17) =187334205a(18) =710915164a(19) =2712899215a(20) =10423811202a(21) =40260795863a(22) =156235895528a(23) =609176113446
External references
- oeis: A148580