220220

Appears in sequences

• Triangle T(n,k) of number of minimal 4-covers of a labeled n-set that cover k points of that set uniquely (k=4,..,n).at n=12A057965
• Expansion of (1+6*x+16*x^2+8*x^3+x^4)/(1-x)^8.at n=10A244883
• Number of ways to pay n dollars using Canadian coins, that is: nickels (5 cents), dimes (10 cents), quarters (25 cents), loonies (100 cents or $1 coins) and toonies ($2 coins).at n=21A307849
• Number of ordered set partitions of [n] where the maximal block size equals nine.at n=4A320765
• Triangle read by rows: T(n, m) = (n+1-m)*C(2*n+2-m, m)*C(3*n-3*m+2, n-m+1)/(2*n-m+2).at n=31A360546