21448

Appears in sequences

• Expansion of Product_{m>=1} 1/(1 - m*q^m)^8.at n=6A022732
• Number of partitions of n into parts not of the form 21k, 21k+4 or 21k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 9 are greater than 1.at n=40A035982
• Number of ways to fold a strip of n stamps taking account of order and direction of folds.at n=7A110837
• Generating primitive Pythagorean triangles by using (n, n+1) gives perimeters for each n. This sequence lists the sum of these perimeters for each n triangles.at n=23A193068