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), (0, 1, 1), (1, 0, -1)}.
A148696
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), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =68a(6) =238a(7) =808a(8) =2938a(9) =10616a(10) =40070a(11) =151690a(12) =586723a(13) =2285518a(14) =9042529a(15) =36023276a(16) =144911726a(17) =586960584a(18) =2396089239a(19) =9837755873a(20) =40629129008a(21) =168667408199a(22) =703695471412
External references
- oeis: A148696