A274180 a(n) = Sum_{k=0..4n} (A035343(n,k) mod 2) * 2^k.

1, 31, 341, 6483, 69905, 2027247, 21041413, 417263459, 4311810305, 133666119455, 1461703693397, 27806864656979, 299071474565137, 8708265758097903, 90161415181374469, 1785159701350222947, 18447025552981295105

Offset

0,2

Comments

a(n) is a binary palindrome (A006995) of 4n+1 bits since A035343(n,k) = A035343(n,4n-k), k=0..4n and A035343(n,0) = A035343(n,4n) = 1.

Links

Gheorghe Coserea, Table of n, a(n) for n = 0..200

Prog

(PARI)
a(n) =  subst(lift(Pol(Mod([1, 1, 1, 1, 1], 2), 'x)^n), 'x, 2);
vector(17, n, a(n-1))

Crossrefs

Cf. A035343.

Sequence in context: A100728 A332945 A296730 * A197644 A295211 A261759

Adjacent sequences: A274177 A274178 A274179 * A274181 A274182 A274183

Keyword

nonn,base

Author

Gheorghe Coserea, Jun 12 2016

Status

approved