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, 0), (0, 1, -1), (0, 1, 0), (1, 0, 0)}.
A149936
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, 0), (0, 1, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =49a(5) =166a(6) =595a(7) =2213a(8) =8406a(9) =32659a(10) =129460a(11) =520077a(12) =2115561a(13) =8708598a(14) =36177828a(15) =151509307a(16) =639429106a(17) =2716329348a(18) =11605358103a(19) =49852770845a(20) =215189799958a(21) =932874529705
External references
- oeis: A149936