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), (1, -1, 1), (1, 0, 1)}.
A148958
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), (1, -1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =106a(6) =404a(7) =1537a(8) =6162a(9) =24766a(10) =102397a(11) =426210a(12) =1802081a(13) =7664693a(14) =33007543a(15) =142705843a(16) =622404766a(17) =2725693390a(18) =12012620447a(19) =53129180250a(20) =236136223997
External references
- oeis: A148958