A394531 Sum_{k=1..n} k^2 * a(k)/n^(2*k) = 1.

1, 3, 60, 3108, 304272, 48129840, 11201299512, 3603434258760, 1532242359629472, 832607118613068768, 563081764177783772040, 463948766006882552966328, 457632794549042955229782000, 532510196733763198548046579728, 721895034242601980158342341828312

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Formula

a(n) = n^(2*(n-1)) - Sum_{k=1..n-1} n^(2*(n-1-k)) * k^2 * a(k).

Crossrefs

Row n=2 of A394530.

Cf. A068087.

Sequence in context: A085990 A202065 A394066 * A036770 A201699 A006821

Adjacent sequences: A394528 A394529 A394530 * A394532 A394533 A394534

Keyword

nonn

Author

Seiichi Manyama, Mar 24 2026

Status

approved