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, -1, 0)}.
A148173
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, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =27a(6) =84a(7) =224a(8) =712a(9) =2006a(10) =6662a(11) =19530a(12) =66075a(13) =200135a(14) =685767a(15) =2140539a(16) =7392879a(17) =23476786a(18) =82121415a(19) =264696045a(20) =931959429a(21) =3044412236a(22) =10778956363a(23) =35653064603a(24) =126785519562a(25) =422881232793
External references
- oeis: A148173