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A027061 as a simple table

na(n)
30
42
56
620
766
8210
9652
101988
115982
1217830
1352782
14155480
15456364
161336066
173904280
1811394244
1933222902
2096812174
21282009512
22821327088
232391918708
246966267782
2520291422370
2659116724728
27172271893036
28502157965938

[0,2,6,20,66,210,652,1988,5982,17830,52782,155480,
 456364,1336066,3904280,11394244,33222902,96812174,
 282009512,821327088,2391918708,6966267782,
 20291422370,59116724728,172271893036,502157965938]