A025573

a(n) = T(2n,n-1), where T is the array defined in A025564.

1, 4, 19, 98, 526, 2892, 16159, 91338, 520794, 2989688, 17256275, 100046894, 582204290, 3398722420, 19894375665, 116724946350, 686260868346, 4042058735880, 23846068472626, 140882925528892, 833421929615236, 4936088399361876, 29266184138206509, 173689743532678182

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