a(n) is the concatenation of n and 6n.

Terms

a(0) =16a(1) =212a(2) =318a(3) =424a(4) =530a(5) =636a(6) =742a(7) =848a(8) =954a(9) =1060a(10) =1166a(11) =1272a(12) =1378a(13) =1484a(14) =1590a(15) =1696a(16) =17102a(17) =18108a(18) =19114a(19) =20120a(20) =21126a(21) =22132a(22) =23138a(23) =24144a(24) =25150a(25) =26156a(26) =27162a(27) =28168a(28) =29174a(29) =30180