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), (-1, 0, 1), (1, 0, -1), (1, 1, 1)}.
A149567
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), (-1, 0, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =61a(5) =201a(6) =945a(7) =3453a(8) =16293a(9) =63145a(10) =298781a(11) =1202799a(12) =5703523a(13) =23577447a(14) =111992747a(15) =472089081a(16) =2245549141a(17) =9608529475a(18) =45757357387a(19) =198121904171a(20) =944424232919
External references
- oeis: A149567