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, 0, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
A148804
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, 0, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =83a(6) =286a(7) =981a(8) =3493a(9) =12469a(10) =45525a(11) =166624a(12) =618123a(13) =2300128a(14) =8638210a(15) =32528611a(16) =123266486a(17) =468285464a(18) =1787276670a(19) =6836101525a(20) =26237809440a(21) =100895198047a(22) =389029486532
External references
- oeis: A148804