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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A044881 as a simple table

na(n)
11001
21002
31003
41004
51005
61006
71007
81008
91009
101011
111022
121033
131044
141055
151066
161077
171088
181099
191101
201102
211103
221104
231105
241106
251107
261108
271109
281120
291121
301123
311124
321125
331126
341127
351128
361129

[1001,1002,1003,1004,1005,1006,1007,1008,1009,
 1011,1022,1033,1044,1055,1066,1077,1088,1099,1101,
 1102,1103,1104,1105,1106,1107,1108,1109,1120,1121,
 1123,1124,1125,1126,1127,1128,1129]