Base-10 weaker Skolem-Langford numbers.

Terms

a(0) =231213a(1) =312132a(2) =12132003a(3) =23121300a(4) =23421314a(5) =30023121a(6) =31213200a(7) =41312432a(8) =1214230043a(9) =1312432004a(10) =2342131400a(11) =2412134003a(12) =3004312142a(13) =3400324121a(14) =4002342131a(15) =4131243200a(16) =4562342536a(17) =4635243265a(18) =5364235246a(19) =5623425364a(20) =6352432654a(21) =6425324635