243360

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=41A059056
• a(0) = 1, a(n) = 20*sigma[3](n).at n=23A091983
• Indices of records in A362452.at n=6A362459