a(n) is the square root of A030676(n).

Terms

a(0) =4a(1) =5a(2) =6a(3) =7a(4) =23a(5) =8a(6) =27a(7) =9a(8) =30a(9) =34a(10) =15a(11) =58a(12) =21a(13) =235a(14) =257a(15) =88a(16) =94a(17) =315a(18) =318a(19) =334a(20) =110a(21) =362a(22) =119a(23) =123a(24) =127a(25) =131a(26) =426a(27) =438a(28) =45a(29) =461