A288995 a(n) = 12 * (A288968(n) - 2).

264, 4152, 77064, 1551576, 33343752, 745374264, 17140046088, 402328199064, 9593786367240, 231629451811896, 5648880427214088, 138910500564007128, 3439808201626085640, 85686183717823968312, 2145402754204531455240, 53956201350487199168280

Offset: 1

Author

Seiichi Manyama, Jun 23 2017

Keywords

• nonn

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..701

Crossrefs

Related to E_{k+2}/E_k: this sequence (k=2), A192731 (k=4), A289061 (k=6).

Cf. A008683, A288877 (E_4*E_2), A288968.

Cf. A289062.

Formula

a(n) = (1/n) * Sum_{d|n} A008683(n/d) * A288877(d).