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A018249 as a simple table

na(n)
01
12
26
318
452
5130
6310
7718
81618
93670
108160
1117862
1238872
1384016
14180502
15386092
16821640
171742536
183681130
197754076
2016290046
2134136028
2271378568
23148948138
24310248240
25645155196
261339484196
272777105128
285750079046

[1,2,6,18,52,130,310,718,1618,3670,8160,17862,
 38872,84016,180502,386092,821640,1742536,3681130,
 7754076,16290046,34136028,71378568,148948138,
 310248240,645155196,1339484196,2777105128,
 5750079046]