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A121203 as a simple table

na(n)
00
14
228
3224
41784
513692
6102036
7745432
85374192
938400500
10272709644
111928498640
1213597146600
1395668307308
14672119557252
154717043931848
1633080342679008
17231867574534116
181624598900644860
1911379821699045056

[0,4,28,224,1784,13692,102036,745432,5374192,
 38400500,272709644,1928498640,13597146600,
 95668307308,672119557252,4717043931848,
 33080342679008,231867574534116,1624598900644860,
 11379821699045056]