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, 1, 0), (1, 0, 0), (1, 1, -1)}.
A149977
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, 1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =56a(5) =214a(6) =854a(7) =3524a(8) =14956a(9) =64779a(10) =285576a(11) =1276474a(12) =5772900a(13) =26364344a(14) =121406614a(15) =563071754a(16) =2627573408a(17) =12327598936a(18) =58109294319a(19) =275054543064
External references
- oeis: A149977