Number of 4 X n binary matrices with 1 unit column up to row and column permutations.

Terms

a(0) =1a(1) =6a(2) =27a(3) =102a(4) =333a(5) =969a(6) =2572a(7) =6309a(8) =14472a(9) =31333a(10) =64500a(11) =127011a(12) =240475a(13) =439626a(14) =778848a(15) =1341286a(16) =2251350a(17) =3691629a(18) =5925443a(19) =9326451a(20) =14417175a(21) =21918490a(22) =32812572a(23) =48422262a(24) =70510271a(25) =101402091a(26) =144137322a(27) =202654565a(28) =282015876a(29) =388677651