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A003471 as a simple table

na(n)
01
10
20
30
44
516
680
7672
84752
948768
10440192
115377280
1259245120
13839996160
1410930514688
15176547098112
162649865335040
1748047352500224
18817154768973824
1916438490531536896
20312426715251262464
216906073926286725120
22145060238642780180480
233495192502897779875840

[1,0,0,0,4,16,80,672,4752,48768,440192,5377280,
 59245120,839996160,10930514688,176547098112,
 2649865335040,48047352500224,817154768973824,
 16438490531536896,312426715251262464,
 6906073926286725120,145060238642780180480,
 3495192502897779875840]