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A010975 as a simple table

na(n)
221
2323
24276
252300
2614950
2780730
28376740
291560780
305852925
3120160075
3264512240
33193536720
34548354040
351476337800
363796297200
379364199760
3822239974430
3951021117810
40113380261800
41244662670200
42513791607420
431052049481860
442104098963720
454116715363800

[1,23,276,2300,14950,80730,376740,1560780,5852925,
 20160075,64512240,193536720,548354040,1476337800,
 3796297200,9364199760,22239974430,51021117810,
 113380261800,244662670200,513791607420,
 1052049481860,2104098963720,4116715363800]