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A147688 as a simple table

na(n)
01
16
244
3360
43088
526976
6237248
72091648
818456832
9162915840
101438198784
1112696741888
12112091336704
13989587267584
148736489783296
1577129433907200
16680931492954112
176011553766047744
1853072563389857792
19468547255228956672

[1,6,44,360,3088,26976,237248,2091648,18456832,
 162915840,1438198784,12696741888,112091336704,
 989587267584,8736489783296,77129433907200,
 680931492954112,6011553766047744,
 53072563389857792,468547255228956672]