80142

Appears in sequences

• Partial sums of n 3-spaced triangular numbers beginning with t(3), e.g., a(2) = t(3)+t(6) = 6+21 = 27.at n=36A085788
• Row sums of A103441. Number of two-colored bracelets of n beads with different sets of distances among the white beads.at n=20A103442
• Sum_{0<j<k<=n} s(k)-s(j), where s(j)=A002620(j) is the j-th quarter-square.at n=35A206806
• Number of (w,x,y,z) with all terms in {1,...,n} and w>=2x and y>3z.at n=38A212522