Maximal apex value of an addition triangle whose base is a permutation of {k-n/2, k=0..n}.

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =13a(5) =36a(6) =94a(7) =232a(8) =557a(9) =1300a(10) =2986a(11) =6744a(12) =15074a(13) =33320a(14) =73116a(15) =159184a(16) =344701a(17) =742068a(18) =1590898a(19) =3395320a(20) =7222550a(21) =15308920a(22) =32362276a(23) =68213424a(24) =143463378a(25) =300999816a(26) =630353764a(27) =1317415792a(28) =2748991012a(29) =5726300880