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, 0, 1), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
A149455
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, 0, 1), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =50a(5) =182a(6) =712a(7) =2711a(8) =10672a(9) =41470a(10) =164102a(11) =644580a(12) =2557808a(13) =10108272a(14) =40194806a(15) =159440027a(16) =634857536a(17) =2524253822a(18) =10061284624a(19) =40067909864a(20) =159820748482a(21) =637157976526
External references
- oeis: A149455