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, 0, -1), (1, -1, 1), (1, 1, 1)}.
A149685
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, 0, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =265a(6) =1117a(7) =4693a(8) =20207a(9) =87453a(10) =383977a(11) =1692995a(12) =7529303a(13) =33622577a(14) =151048337a(15) =680873667a(16) =3082403441a(17) =13995118907a(18) =63753704231a(19) =291136273959
External references
- oeis: A149685