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, 0, 1), (0, -1, 1), (1, 1, -1), (1, 1, 1)}.
A149640
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, 0, 1), (0, -1, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =69a(5) =273a(6) =1229a(7) =5319a(8) =24415a(9) =109221a(10) =511977a(11) =2334665a(12) =11081693a(13) =51334913a(14) =245326757a(15) =1150864887a(16) =5526605251a(17) =26166379639a(18) =126192482499a(19) =601515563957
External references
- oeis: A149640