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, 1, -1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148405
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, 1, -1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =17a(5) =51a(6) =198a(7) =687a(8) =2836a(9) =10749a(10) =46067a(11) =184597a(12) =812310a(13) =3381735a(14) =15171550a(15) =64957583a(16) =295681089a(17) =1293489193a(18) =5954355415a(19) =26493181563a(20) =123052625899a(21) =555024101601
External references
- oeis: A148405