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, 0, 0), (0, -1, 0), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149437
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, 0, 0), (0, -1, 0), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =46a(5) =173a(6) =687a(7) =2761a(8) =11324a(9) =47305a(10) =200512a(11) =858136a(12) =3705606a(13) =16136055a(14) =70762084a(15) =312140489a(16) =1384023100a(17) =6166060651a(18) =27588011071a(19) =123900214425a(20) =558332251754
External references
- oeis: A149437