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), (-1, 1, 0), (1, 0, -1), (1, 1, 0)}.
A149156
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), (-1, 1, 0), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =39a(5) =112a(6) =512a(7) =1660a(8) =7796a(9) =27224a(10) =129917a(11) =477245a(12) =2301281a(13) =8769055a(14) =42591564a(15) =166860618a(16) =814734888a(17) =3262097542a(18) =15991318693a(19) =65159871299a(20) =320406115972
External references
- oeis: A149156