Cogrowth sequence for the 14-element dihedral group D7 = <S,T | S^7, T^2, (ST)^2>.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =3a(5) =0a(6) =10a(7) =1a(8) =35a(9) =9a(10) =126a(11) =55a(12) =462a(13) =286a(14) =1717a(15) =1365a(16) =6451a(17) =6188a(18) =24463a(19) =27132a(20) =93518a(21) =116281a(22) =360031a(23) =490337a(24) =1394582a(25) =2043275a(26) =5430530a(27) =8439210a(28) =21242341a(29) =34621041