A174743 Partial sums of A076766.

1, 3, 7, 15, 31, 63, 131, 279, 621, 1469, 3766, 10694, 34728, 133582, 636719, 3955451, 33664265, 407703531, 7147333784, 180948983492, 6537204164708, 332740721681412, 23627093701822296, 2324803141466748032, 315610211340647518667, 58953876234603150481383

Offset

0,2

Comments

Number of inequivalent binary linear codes of length <= n. Also the total number of nonisomorphic binary matroids on an k-set for all k <= n. The subsequence of primes is: 3, 7, 31, 131.

Links

Table of n, a(n) for n=0..25.

Example

a(14) = 1 + 2 + 4 + 8 + 16 + 32 + 68 + 148 + 342 + 848 + 2297 + 6928 + 24034 + 98854 + 503137 = 636719 is prime.

Crossrefs

Cf. A076766, A076831, A034328, A055545.

Sequence in context: A057613 A325920 A351754 * A146686 A309172 A178459

Adjacent sequences: A174740 A174741 A174742 * A174744 A174745 A174746

Keyword

nonn

Author

Jonathan Vos Post, Nov 30 2010

Status

approved