A152403 Column 3 of triangle A152400.
1, 4, 24, 182, 1636, 16844, 194384, 2476868, 34461956, 519070980, 8405444924, 145502477888, 2679656009072, 52289220500822, 1077289873778412, 23361106832257087, 531744673834247758, 12673569230875132668
Offset: 0
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