A class of Boolean functions of n variables and rank 4.

Terms

a(0) =0a(1) =0a(2) =0a(3) =16a(4) =389a(5) =3112a(6) =16231a(7) =66177a(8) =228438a(9) =697219a(10) =1932601a(11) =4953493a(12) =11892484a(13) =27003029a(14) =58421782a(15) =121154728a(16) =241995312a(17) =467422242a(18) =875997590a(19) =1597434614a(20) =2841382379a(21) =4940146414a(22) =8411111897a(23) =14046656347a(24) =23041951126a(25) =37174397565a(26) =59052693975a(27) =92458885395