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), (0, 0, -1), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
A149075
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), (0, 0, -1), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =7a(4) =28a(5) =62a(6) =246a(7) =657a(8) =2518a(9) =7746a(10) =28610a(11) =97018a(12) =351968a(13) =1267138a(14) =4608816a(15) =17111597a(16) =63199376a(17) =237990728a(18) =895931962a(19) =3401928286a(20) =13017241734a(21) =49840610290a(22) =192867979884a(23) =745646164078
External references
- oeis: A149075