112345

Appears in sequences

• a(n) = floor( n*(n-1)*(n-2)*(n-3)/29 ).at n=44A011939
• a(n) = min{p + q + r + ...} where p,q,r,... are distinct unary numbers - containing only ones, i.e., of the form (10^k - 1)/9 - formed by using a total of n ones.at n=15A110380
• Number of n X 4 0..1 arrays with each 1 adjacent to 1 or 4 king-move neighboring 1s.at n=7A296015
• Irregular triangle read by rows: to get row n, take partitions of n ordered as in A080577, and in each partition, change each j-th occurrence of k to j; use compressed notation as in A322761.at n=42A322762
• a(1)=1, and for n>1, a(n) = a(n-1) concatenated with the length of the decimal representation of a(n-1).at n=5A383429