Number of truth tables of bracketed formulas (case 3).

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =9a(5) =46a(6) =262a(7) =1588a(8) =10053a(9) =65686a(10) =439658a(11) =2999116a(12) =20774154a(13) =145726348a(14) =1033125004a(15) =7390626280a(16) =53281906861a(17) =386732675046