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A181806 as a simple table

na(n)
11
22
34
412
524
648
7120
8240
9360
10720
115040
1210080
1315120
1430240
1560480
16151200
17166320
18332640
19665280
201663200
211995840
223326400
238648640
2417297280
2521621600
2643243200
2786486400
28129729600
29259459200
30735134400

[1,2,4,12,24,48,120,240,360,720,5040,10080,15120,
 30240,60480,151200,166320,332640,665280,1663200,
 1995840,3326400,8648640,17297280,21621600,
 43243200,86486400,129729600,259459200,735134400]