cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-5 of 5 results.

A028405 Number of equivalence classes of Boolean functions of n variables under action of M(n,2).

Original entry on oeis.org

3, 6, 16, 76, 2529, 935339497, 2060570964519821009024090, 21566641941095278268628659206747626784474429009806143425562
Offset: 1

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Author

Keywords

Comments

Group M(n,2) is semi-direct product of LSD(n,2) (cf. A028407) and complementing group C(n,2).

References

  • V. Jovovic, The cycle index polynomials of some classical groups, Belgrade, 1995, unpublished.

Crossrefs

Extensions

More terms from Vladeta Jovovic

A000614 Number of complemented types of Boolean functions of n variables under action of AG(n,2).

Original entry on oeis.org

2, 3, 6, 18, 206, 7888299, 8112499583888855378066, 42287533217833953489054778023401252726576585396037133766
Offset: 1

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Author

Keywords

Comments

From Philippe Langevin's article: Let m be a positive integer. The space of Boolean functions from GF(2)^m into GF(2) is denoted by RM(k,m). This notation comes from coding theory, where it is the Reed-Muller code of order k in m variables. The affine group AG(2, m) acts on the spaces RM(k,m), and thus on RM(k,m)/RM(s,m) when s <= k. - Jonathan Vos Post, Feb 08 2011

References

  • R. J. Lechner, Harmonic Analysis of Switching Functions, in A. Mukhopadhyay, ed., Recent Developments in Switching Theory, Ac. Press, 1971, pp. 121-254, esp. p. 186.
  • N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
  • N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Crossrefs

Cf. A000214.

Extensions

More terms and better description from Vladeta Jovovic, Feb 24 2000

A053037 Number of self-complementary types of Boolean functions of n variables under action of AG(n,2).

Original entry on oeis.org

1, 1, 2, 4, 30, 7679, 271272025838, 15720888748969530981971252414, 14069509983003731045582973059193483755803287927789561328867085226, 1263863542103738914337052461143370675118811161046459223145205641421535664947642082708619717652803582292264797662579828105738049380777191460
Offset: 1

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Author

Vladeta Jovovic, Feb 24 2000

Keywords

Comments

Heuristically a(n) = A000214(n)-A049461(n+1). - R. J. Mathar, Apr 23 2007

References

  • V. Jovovic, The cycle index polynomials of some classical groups, Belgrade, 1995, unpublished.

Crossrefs

A098744 Triangle read by rows: row n gives the number of orbits of the group GA(n) acting on binary vectors of length 2^n and weight k, for n >= 0, 0 <= k <= 2^n.

Original entry on oeis.org

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 3, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 4, 5, 8, 9, 15, 16, 23, 24, 30, 30, 38, 30, 30, 24, 23, 16, 15, 9, 8, 5, 4, 2, 2, 1, 1, 1, 1
Offset: 0

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Author

Alexander Vardy (avardy(AT)ucsd.edu), Nov 15 2008

Keywords

Comments

GA(n) is the general affine group, the automorphism group of the Reed-Muller code RM(r,n).
Since the group is triply transitive, there's only one orbit for vectors of weight 0,1,2,3.

Examples

			Triangle begins:
1 1
1 1 1
1 1 1 1 1
1 1 1 1 2 1 1 1 1 (the 2 is because there are two orbits on vectors of length 8 and weight 4)
1 1 1 1 2 2 3 3 4 3 3 2 2 1 1 1 1
		

Crossrefs

Cf. A000214 (row sums). - Vladeta Jovovic, Feb 22 2009

Extensions

More terms from Vladeta Jovovic, Feb 22 2009

A176637 Partial sums of A000614.

Original entry on oeis.org

2, 5, 11, 29, 235, 7888534, 8112499583888863266600, 42287533217833953489054778023401260839076169284900400366
Offset: 1

Views

Author

Jonathan Vos Post, Apr 22 2010

Keywords

Comments

Partial sums of complemented types of Boolean functions of n variables under action of AG(n,2). The only known primes in this sequence are the first 4 values: 2, 5, 11, 29.

Examples

			a(5) = 2 + 3 + 6 + 18 + 206 = 235.
		

Crossrefs

Formula

a(n) = SUM[i=1..n] A000614(i).
Showing 1-5 of 5 results.