304290
domain: N
Appears in sequences
- "CHK" (necklace, identity, unlabeled) transform of 1, 2, 3, 4, ...at n=15A032170
- Numbers k such that sigma(k+1) = 5*phi(k).at n=22A067263
- Inverse EULER transform of A064831 (with its initial 1 omitted).at n=16A072337
- Recursive triangle for calculating A186491.at n=33A186492
- a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^2, where Lucas(n) = A000204(n).at n=15A203853
- Number of n X 2 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=14A300344