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, 1, 1), (1, 0, -1), (1, 0, 0)}.
A148231
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, 1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =34a(6) =110a(7) =307a(8) =1080a(9) =3307a(10) =11710a(11) =36855a(12) =134684a(13) =442897a(14) =1626174a(15) =5433787a(16) =20284552a(17) =69513936a(18) =260291202a(19) =901425383a(20) =3410246640a(21) =12005552193a(22) =45512621254a(23) =161416166078a(24) =616236497726
External references
- oeis: A148231