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A371313 as a simple table

na(n)
01
12
28
340
4254
51868
615996
7153144
81637520
919191072
10245463936
113390905472
1250406479328
13800678811840
1413547088596544
15242995426574976
164607744279916672
1792046384885051648
181932579234508861440
1942530614791735573504
20979132781170084872960
2123529915213836747927040

[1,2,8,40,254,1868,15996,153144,1637520,19191072,
 245463936,3390905472,50406479328,800678811840,
 13547088596544,242995426574976,4607744279916672,
 92046384885051648,1932579234508861440,
 42530614791735573504,979132781170084872960,
 23529915213836747927040]