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, 0, 0)}.
A149841
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, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =36a(5) =110a(6) =362a(7) =1156a(8) =3858a(9) =13140a(10) =44538a(11) =154572a(12) =533950a(13) =1864942a(14) =6586844a(15) =23228542a(16) =82703466a(17) =294399864a(18) =1052887478a(19) =3788424618a(20) =13629870990a(21) =49277518878a(22) =178247528092a(23) =646510370750
External references
- oeis: A149841