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, 1), (0, 1, -1), (1, 1, 1)}.
A149621
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, 1), (0, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =65a(5) =247a(6) =1073a(7) =4429a(8) =19531a(9) =83855a(10) =374813a(11) =1646373a(12) =7436141a(13) =33160711a(14) =150961707a(15) =680557859a(16) =3116996709a(17) =14167970351a(18) =65200939457a(19) =298276795781
External references
- oeis: A149621