Number of n-gonal inositol homologs with 2 kinds of achiral proligands.

Terms

a(0) =2a(1) =6a(2) =10a(3) =31a(4) =68a(5) =226a(6) =650a(7) =2259a(8) =7542a(9) =27036a(10) =96350a(11) =352786a(12) =1294652a(13) =4806366a(14) =17912120a(15) =67160083a(16) =252710672a(17) =954641186a(18) =3617076710a(19) =13744708060a(20) =52358745532a(21) =199914446106a(22) =764881848410