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A271677 as a simple table

na(n)
10
22
34
4132
53440
6358792
771771952
839547904272
951276433391328
10167894702548149600
111348410361035047416704

[0,2,4,132,3440,358792,71771952,39547904272,
 51276433391328,167894702548149600,
 1348410361035047416704]