121570

Appears in sequences

• Number of different strings of length n+4 obtained from "123...n" by iteratively duplicating any substring.at n=36A137741
• Number of partitions of n with eight sorts of part 1 which are introduced in ascending order.at n=10A320739
• Number of regions in a polygon whose boundary consists of n+2 equally spaced points around a semicircle and three equally spaced points along the diameter (a total of n+3 points). See Comments for precise definition.at n=39A333642