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, 0, 1), (0, 1, 0), (1, -1, -1), (1, -1, 1)}.
A148248
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, 0, 1), (0, 1, 0), (1, -1, -1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =36a(6) =120a(7) =405a(8) =1393a(9) =4830a(10) =17433a(11) =63618a(12) =233299a(13) =874696a(14) =3320439a(15) =12653584a(16) =48669008a(17) =189332510a(18) =739327998a(19) =2899957479a(20) =11465903125a(21) =45547362769a(22) =181415934245a(23) =726323099412
External references
- oeis: A148248