89386

Appears in sequences

• a(n) = Sum_{k=0..m} (k+1) * A026148(n, k), where m=0 for n=1; m=n+1 for n >= 2.at n=9A027333
• Take pairs (a, b), sorted on a, such that T(a)+T(b)=concatenation of a and b, where T(k) is the k-th triangular number A000217(k). Sequence gives values of b.at n=36A096032
• Take pairs (a, b), sorted on a, such that T(a)+T(b)=concatenation of a and b, where T(k) is the k-th triangular number A000217(k). Sequence gives values of b.at n=39A096032
• Number of (1,2,3)-matching compositions of n.at n=18A335514