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, 0), (-1, 0, 1), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
A148757
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, 0), (-1, 0, 1), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =28a(5) =80a(6) =343a(7) =1109a(8) =4957a(9) =17265a(10) =79054a(11) =289714a(12) =1348498a(13) =5126901a(14) =24142264a(15) =94383071a(16) =448304541a(17) =1791386504a(18) =8565590298a(19) =34836181497a(20) =167448617851a(21) =690969359292
External references
- oeis: A148757