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, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 1)}.
A148782
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, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =24a(5) =76a(6) =249a(7) =828a(8) =2810a(9) =9685a(10) =33665a(11) =117907a(12) =416736a(13) =1480881a(14) =5284589a(15) =18955873a(16) =68263775a(17) =246532461a(18) =893166098a(19) =3245162305a(20) =11816472278a(21) =43118632373a(22) =157670651123a(23) =577552892619
External references
- oeis: A148782