450000000000
domain: N
Appears in sequences
- Sum of digits of numbers between 0 and (10^n)-1.at n=10A034967
- Number of n-digit even numbers.at n=11A137233
- Number of shapes of balanced 10-ary trees with n nodes, where a tree is balanced if the total number of nodes in subtrees corresponding to the branches of any node differ by at most one.at n=22A229395
- Number of n-digit positive integers that are the product of two integers ending with 2.at n=12A346629