24823

Appears in sequences

• Number of Motzkin paths of length n, starting with an up step, ending with a down step and having no peaks (can be easily expressed using RNA secondary structure terminology).at n=16A097779
• Number of partitions of {1,..,n} into any number of lists of size not equal to 3, where a list means an ordered subset, cf. A000262.at n=7A113236
• Number of binary words of length n containing at least one subword 100001 and no subwords 10^{i}1 with i<4.at n=36A143284
• Numbers k such that sopfr(k + bigomega(k)) = sopfr(k).at n=32A187877
• Numbers k such that sopfr(k + omega(k)) = sopfr(k), where sopfr(i) = A001414(i) and omega(i) = A001221(i).at n=24A187878
• Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.at n=10A196207
• First occurrence of n in A212844.at n=30A213085
• a(n) = prime(n) * prime(2*n-1).at n=26A219603
• Number of tilings of a 12 X n rectangle using integer-sided square tiles of area > 1.at n=12A226376
• Number of distinct eigenvalues of n X n matrices with elements {-1, 0, +1}.at n=3A271570
• Numbers which are palindromic in their Elias delta code representation.at n=45A281380
• Number of tilings of an n X n square using integer-sided square tiles of area > 1.at n=12A347800
• Products of exactly two distinct primes in A090252, in order of appearance.at n=61A354160
• Products of exactly two distinct odd primes in A090252, in order of appearance.at n=58A354162