67920

Appears in sequences

• Penrice Christmas gift numbers, Card-matching numbers (Dinner-Diner matching numbers): Triangle T(n,k) = number of ways to get k matches for a deck with n cards, 2 of each kind.at n=42A059056
• Expansion of e.g.f. Series_Reversion(1 - exp(-x) - x^4).at n=6A392721
• Expansion of e.g.f. -1/(1 - LambertW(x*log(1-x))).at n=8A392881