20449

Appears in sequences

• Numerator of (binomial(2*n-2,n-1)/n!)^2.at n=8A004936
• Numerator of (binomial(2*n-2,n-1)/n!)^2.at n=7A004936
• a(n) = (5*n + 3)^2.at n=28A016886
• a(n) = (6*n + 5)^2.at n=23A016970
• a(n) = (7*n + 3)^2.at n=20A017018
• a(n) = (8*n + 7)^2.at n=17A017150
• a(n) = (9*n + 8)^2.at n=15A017258
• a(n) = (10*n + 3)^2.at n=14A017306
• a(n) = (11*n)^2.at n=13A017390
• a(n) = (12*n + 11)^2.at n=11A017654
• Distinct odd elements in the 5-Pascal triangle A028313.at n=31A028319
• Elements to the right of the central elements of the 5-Pascal triangle A028313 that are not 1.at n=49A028324
• Odd elements to the right of the central elements of the 5-Pascal triangle A028313.at n=42A028325
• Numbers that are both lucky and square.at n=25A031162
• Squares with initial digit '2'.at n=15A045785
• a(1)=7; if n = Product p_i^e_i, n > 1, then a(n) = Product p_{i+4}^e_i.at n=35A045970
• a(1)=9; if n = Product p_i^e_i, n > 1, then a(n) = Product p_{i+2}^{e_i+1}.at n=34A045972
• (Terms in A014762)/4.at n=19A051514
• Squares with digital root 1.at n=31A061099
• Odd nonprimes squared, or A014076(n)^2.at n=38A062532