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), (0, 0, -1), (1, -1, 0), (1, 1, 0)}.
A149202
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), (0, 0, -1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =39a(5) =127a(6) =509a(7) =1897a(8) =7749a(9) =31147a(10) =130112a(11) =545708a(12) =2331309a(13) =10037789a(14) =43719016a(15) =191747526a(16) =848165641a(17) =3773572327a(18) =16898460414a(19) =76053411328a(20) =344014622051
External references
- oeis: A149202