0,2

Jinyuan Wang, Table of n, a(n) for n = 0..1000

(PARI) a(n) = if( n<0, 0, polcoeff( (1 + 2 * x * Ser(qfrep( [ 2, 1; 1, 8], n, 1)))^2, n)); \\ Jinyuan Wang, Feb 19 2020

Sequence in context: A021698 A199739 A121547 * A205507 A137862 A006805

Adjacent sequences: A028623 A028624 A028625 * A028627 A028628 A028629

nonn

N. J. A. Sloane.

More terms from Jinyuan Wang, Feb 19 2020

approved