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A111276 as a simple table

na(n)
10
20
30
40
50
64
714
860
9210
10728
112442
128252
1327716
1493924
15319964
161098900
173800928
1813244836
1946460738
20164015272
21582353976
222078812492
237457141650
2426871707908
2597236327900
26353213328024
271287648322950
284709765510884
2917279999438748
3063583033400968

[0,0,0,0,0,4,14,60,210,728,2442,8252,27716,93924,
 319964,1098900,3800928,13244836,46460738,
 164015272,582353976,2078812492,7457141650,
 26871707908,97236327900,353213328024,
 1287648322950,4709765510884,17279999438748,
 63583033400968]