22938

Appears in sequences

• Number of n-node rooted identity trees of height at most 5.at n=22A038084
• Numbers whose base-4 representation contains exactly four 1's and four 2's.at n=6A045109
• Numbers n such that 5*10^n + 4*R_n + 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=17A103015
• Number of 2 X 2 nonsingular 0..n matrices with a(1,1) <= a(1,2) <= a(2,1) <= a(2,2).at n=24A183763
• Number of 3 X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 0 and 1 1 1 vertically.at n=10A207347
• a(n) = A255464(2^n-1).at n=7A255465
• Number of n X n 0..1 arrays with every element equal to 0, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.at n=7A298661
• G.f.: 1 + Sum_{n>=1} a(n)*x^n/(1 - x^n) = Product_{n>=1} (1 + x^n)/(1 - x^n).at n=23A300274
• The length of the shortest prefix of the Thue-Morse word decomposable to not less than n palindromes.at n=11A320429