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A003000 as a simple table

na(n)
01
12
22
34
46
512
620
740
874
9148
10284
11568
121116
132232
144424
158848
1617622
1735244
1870340
19140680
20281076
21562152
221123736
232247472
244493828
258987656
2617973080
2735946160
2871887896
29143775792
30287542736
31575085472
321150153322
332300306644
344600578044
359201156088

[1,2,2,4,6,12,20,40,74,148,284,568,1116,2232,4424,
 8848,17622,35244,70340,140680,281076,562152,
 1123736,2247472,4493828,8987656,17973080,35946160,
 71887896,143775792,287542736,575085472,1150153322,
 2300306644,4600578044,9201156088]