61606881612
domain: N
Appears in sequences
- Closed meandric numbers (or meanders): number of ways a loop can cross a road 2n times.at n=14A005315
- Meandric numbers: number of ways a river can cross a road n times.at n=27A005316
- Number of ways that a directed line (or river) that starts in the south can cross an east-west road n times.at n=27A077014