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, -1), (0, 0, 1), (0, 1, 1), (1, -1, -1)}.
A149874
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, -1), (0, 0, 1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =42a(5) =138a(6) =491a(7) =1734a(8) =6612a(9) =24870a(10) =97583a(11) =380218a(12) =1541360a(13) =6179237a(14) =25482059a(15) =104303570a(16) =437439838a(17) =1819760781a(18) =7724694109a(19) =32573638812a(20) =139701430732a(21) =595473172306
External references
- oeis: A149874