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), (-1, 1, 1), (1, 0, -1), (1, 1, 1)}.
A149646
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), (-1, 1, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =71a(5) =243a(6) =1187a(7) =4461a(8) =22011a(9) =86925a(10) =430971a(11) =1756329a(12) =8734581a(13) =36405705a(14) =181377819a(15) =768766449a(16) =3834384729a(17) =16464218723a(18) =82179561905a(19) =356541284253
External references
- oeis: A149646