21575

Appears in sequences

• Number of fusenes with 23 hexagons, C_(2v) symmetry and containing n carbon atoms.at n=12A122097
• A129957(n) - n*(n-1)/2.at n=28A129959
• Number of lower triangles of a 3 X 3 0..n array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less.at n=21A195249
• Products of 3 evil primes (A027699) p,q,r, such that numbers p*q, p*r, q*r, and p*q*r are odious (A000069).at n=24A230353
• Molien series for invariants of finite Coxeter group D_10 (bisected).at n=39A266773
• Number of nX5 0..1 arrays with every element equal to 0, 1, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=7A303194
• Number of ways to choose a multiset of values whose sum is n from the first floor(1+log_2(n)) rows of Pascal's triangle.at n=47A366120
• Numbers k whose binary expansion contains 2 adjacent 1's and A391571(k) = k.at n=46A391581