21418

Appears in sequences

• Number of paths on square lattice.at n=9A006191
• Number of partitions in parts not of the form 25k, 25k+3 or 25k-3. Also number of partitions with at most 2 parts of size 1 and differences between parts at distance 11 are greater than 1.at n=41A036002
• Number of rooted identity trees with 2-colored leaves.at n=11A038075
• Numbers k such that 100k+1, 100k+3, 100k+7, 100k+9 are all primes.at n=30A064687
• Number of ways to reciprocally link elements of an 5 X n array either to themselves or to exactly two horizontal and antidiagonal neighbors, without consecutive collinear links.at n=8A220710
• Numbers for which the cube of the sum of the digits is equal to the square of the product of their digits.at n=30A241846
• Number of integer partitions of n whose number of nontrivial submultisets is greater than their number of distinct parts times their number of parts minus 1.at n=37A328960