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, -1), (1, -1, 0), (1, 1, 0)}.
A149200
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, -1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =38a(5) =133a(6) =512a(7) =2022a(8) =8128a(9) =33730a(10) =141324a(11) =602890a(12) =2601778a(13) =11334514a(14) =49900585a(15) =221172359a(16) =987885412a(17) =4439103756a(18) =20057110137a(19) =91101700558a(20) =415588883336
External references
- oeis: A149200