Main diagonal of polygonal lucky array defined in A128511.

Terms

a(0) =1a(1) =9a(2) =477a(3) =2415a(4) =2059a(5) =2133a(6) =651a(7) =2835a(8) =14935a(9) =23529a(10) =35721a(11) =58311a(12) =27105a(13) =24013a(14) =167775a(15) =49375a(16) =92925a(17) =193305a(18) =273105a(19) =238855a(20) =850155a(21) =94209a(22) =395901a(23) =1055241a(24) =310233a(25) =387001a(26) =1492839a(27) =540765a(28) =731025a(29) =2172081