A270482 - OEIS

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A270482 as a simple table

n	a(n)
1	4
2	21
3	278
4	669885
5	722495314784
6	518991396646391611675178
7	1140942688502784034709261534054801143469100357774
8	3057883757819924789715910581052335037849699410792383985720220681289207821611036680026225078199178

[4,21,278,669885,722495314784, 518991396646391611675178, 1140942688502784034709261534054801143469100357774, 30578837578199247897159105810523350378496994107923\ 83985720220681289207821611036680026225078199178]