27968

Appears in sequences

• a(n) = floor( n*(n-1)*(n-2)*(n-3)/27 ).at n=31A011937
• Least k such that the first k terms of A006928 contain n more 2's than 1's.at n=17A025507
• Number of partitions of 5n such that cn(1,5) = cn(4,5) <= cn(0,5) < cn(2,5) = cn(3,5).at n=13A036885
• Sum{T(i,n-i): i=0,1,...,n}, array T given by A047010.at n=16A047011
• Numbers k such that 2^k - 23 is prime.at n=18A057220
• Second smallest multiple of n whose digits sum to n.at n=31A245065
• The number of down-up permutations of [n] where adjacent elements differ by at least 3.at n=11A249390
• Numbers which are representable as a sum of nineteen but no fewer consecutive nonnegative integers.at n=32A270303
• Indices in A006928 where the imbalance between 1's and 2's sets a new record.at n=30A274775