21190

Appears in sequences

• Number of factorizations with 3 levels of parentheses indexed by prime signatures. A050340(A025487).at n=27A050341
• Number n-cyclic graphs.at n=12A081809
• Even numbers of the form floor( binomial(2k, 2j)/binomial(k, j)).at n=12A111304
• Number of Sidon subsets of {1,...,n} of size 6.at n=28A241690
• Beastly reciprocals, or numbers k such that digitsum(1/k) = 666.at n=35A244661
• Number of growing self-avoiding walks with displacement n on a half-infinite strip of height 3 with a trapped endpoint.at n=7A374298