31274

Appears in sequences

• Having specified two initial terms, the "Half-Fibonacci" sequence proceeds like the Fibonacci sequence, except that the terms are halved before being added if they are even.at n=37A120424
• Numbers k such that A(k+1) = A(k) + 1, where A() = A005101() are the abundant numbers.at n=37A169822
• Number of scalene triangles, distinct up to congruence, on an n X n grid (or geoboard).at n=20A190313
• Number of compositions of n whose negation is not unimodal.at n=16A332669
• Number of embeddings on the sphere of 2-connected homeomorphically irreducible planar graphs with n edges.at n=13A378076