18938

Appears in sequences

• Number of ordered 5-tuples of integers from [ 2,n ] with no common factors among quadruples.at n=17A015655
• Floor((x^n - (1-x)^n)/2 +.5) where x = (sqrt(4)+1)/2 = 3/2.at n=25A136423
• a(n) = 169*n^2 - 140*n + 29.at n=10A156639
• Number of nX2 0..2 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order.at n=9A222643
• Number of integer partitions of n whose length times maximum is a multiple of n.at n=55A326849
• Numbers k such that the sums (with multiplicity) of prime factors of k and k+1 are both squares.at n=22A359445