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), (1, 0, 0), (1, 1, -1)}.
A148041
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), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =19a(6) =57a(7) =158a(8) =498a(9) =1539a(10) =5153a(11) =17072a(12) =59518a(13) =206979a(14) =745464a(15) =2692747a(16) =9954863a(17) =37024599a(18) =139880339a(19) =532405810a(20) =2049337223a(21) =7946429854a(22) =31083121339a(23) =122394588218a(24) =485449765051
External references
- oeis: A148041