A397547 a(n) = numerator of A069835(n)/2^n.

1, 2, 11, 17, 443, 743, 10159, 17593, 984467, 1734443, 24591493, 43793863, 1252842991, 2247613027, 32350749719, 58349238473, 6750044324867, 12224356333619, 177406570353769, 322314014477851, 9382052284364629, 17089477261939129, 249306090098352089

Offset

0,2

Links

Zhuorui He, Table of n, a(n) for n = 0..100

H. Bateman, Some problems in potential theory, Messenger Math., 52 (1922), 71-78. [Annotated scanned copy]

Prog

(PARI) a(n)=numerator(sum(k=0, n, binomial(n, k)^2*3^k)/2^n)

Crossrefs

Cf. A069835, A397606 (denominators).

Sequence in context: A089592 A106982 A347600 * A043461 A030551 A121848

Adjacent sequences: A397543 A397544 A397545 * A397548 A397549 A397550

Keyword

frac,nonn

Author

Zhuorui He, Jun 30 2026

Status

approved