Number of binary codes of length 6 with n words.

Terms

a(0) =1a(1) =1a(2) =6a(3) =16a(4) =103a(5) =497a(6) =3253a(7) =19735a(8) =120843a(9) =681474a(10) =3561696a(11) =16938566a(12) =73500514a(13) =290751447a(14) =1052201890a(15) =3492397119a(16) =10666911842a(17) =30064448972a(18) =78409442414a(19) =189678764492a(20) =426539774378a(21) =893346071377