A092413 Coefficient of x^n in solution of x = y + y^2 + y^4 + y^8 + ...

1, -1, 2, -6, 20, -70, 256, -970, 3772, -14960, 60280, -246090, 1015700, -4231216, 17767456, -75126078, 319588340, -1366846548, 5873832384, -25350152100, 109828012448, -477486940848, 2082520454864, -9109146150050, 39950535931956

Offset

1,3

Comments

Reversion of Fredholm-Rueppel sequence (A036987) shifted right.

Links

Table of n, a(n) for n=1..25.

Maple

# Using function CompInv from A357588.
CompInv(25, n -> if 2^ilog2(n) = n then 1 else 0 fi); # Peter Luschny, Oct 05 2022

Prog

(PARI) serreverse(sum(k=0, 8, x^(2^k))+O(x^257))

Crossrefs

Cf. A049140.

Sequence in context: A185202 A340891 A049140 * A151285 A150126 A150127

Adjacent sequences: A092410 A092411 A092412 * A092414 A092415 A092416

Keyword

sign

Author

Ralf Stephan, Mar 22 2004

Status

approved