Maximum number of prime implicants of a symmetric function of n Boolean variables.

Terms

a(0) =1a(1) =2a(2) =6a(3) =13a(4) =32a(5) =92a(6) =218a(7) =576a(8) =1698a(9) =4300a(10) =11770a(11) =34914a(12) =91105a(13) =254438a(14) =759488a(15) =2030618a(16) =5746274a(17) =17189858a(18) =46698068a(19) =133334440a(20) =399479982a(21) =1099206284a(22) =3159208516a(23) =9470895658a(24) =26313455375a(25) =76003857800a(26) =227935595004a(27) =638304618462