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.

A002913 High temperature series for spin-1/2 Ising magnetic susceptibility on 3-dimensional simple cubic lattice.

Original entry on oeis.org

1, 6, 30, 150, 726, 3510, 16710, 79494, 375174, 1769686, 8306862, 38975286, 182265822, 852063558, 3973784886, 18527532310, 86228667894, 401225368086, 1864308847838, 8660961643254, 40190947325670, 186475398518726, 864404776466406, 4006394107568934, 18554916271112254, 85923704942057238
Offset: 0

Views

Author

Keywords

References

  • C. Domb, Ising model, in Phase Transitions and Critical Phenomena, vol. 3, ed. C. Domb and M. S. Green, Academic Press, 1974; p. 381.
  • S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 391-406.
  • 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. other quantities: A001393 (partition function), A010571 (internal energy), A002916 (specific heat), A003490 (surface susceptibility), A007287 (layer susceptibility), A010040, A010043, A010046.
Cf. other structures: A002906 (square), A002920 (hexagonal), A002910 (honeycomb), A002914 (b.c.c.), A002921 (f.c.c.), A003119 (diamond), A010556 (4D cubic), A010579 (5D cubic), A010580 (6D cubic), A030008 (7D cubic).
Cf. low-temperature series: A002926 (ferromagnetic), A002915 (antiferromagnetic).
Cf. other models: A002170 (Heisenberg), A003279 (spherical).

Extensions

Corrections and updates from Steven Finch
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Mar 01 2008
Several errors in the sequence were corrected by Per H. Lundow, Jan 17 2011

A010047 High-temperature expansion of Ising model susceptibility chi_4 for 4-d cubic lattice.

Original entry on oeis.org

2, 64, 2336, 99328, 4840832, 267080704, 16467255296, 1123220758528, 83995566282752, 6835730843582464, 601493660302278656, 56912420061511548928, 5762378580637148905472, 621705383408527748890624, 71206666963479522492809216
Offset: 0

Views

Author

Keywords

Crossrefs

Cf. A010557, A010041 (chi_2), A010044 (mu_2), A010045 (square), A010046 (cubic).

Formula

E.g.f.: 2*F(tanh(x)), where F(x) is the g.f. of A010557. - Andrey Zabolotskiy, Nov 19 2024

A010040 High-temperature expansion of Ising model susceptibility chi_2 for cubic lattice.

Original entry on oeis.org

1, 6, 60, 888, 16944, 403296, 11342400, 371718528, 13814409984, 577113570816, 26660675466240, 1354001083680768, 74774085533159424, 4471493494982516736, 287295290091420794880, 19770508871470350532608, 1448690057046948138123264, 112756550398510017376813056
Offset: 0

Views

Author

Keywords

Crossrefs

Cf. A002913, A010039 (square), A010041 (4D cubic), A010043 (mu_2), A010046 (chi_4), A002170 (Heisenberg).

Formula

E.g.f.: F(tanh(x)), where F(x) is the g.f. of A002913. - Andrey Zabolotskiy, Nov 19 2024

Extensions

Name clarified, terms a(15) and beyond using data from A002913 added by Andrey Zabolotskiy, Nov 25 2024

A010045 High-temperature expansion of Ising model susceptibility chi_4 for square lattice.

Original entry on oeis.org

2, 32, 528, 9728, 197568, 4424192, 108461568, 2895515648, 83657776128, 2602257293312, 86733041246208, 3084465770528768, 116595295651135488, 4668952802696364032, 197452751427562242048, 8794599595709419225088, 411518238008892605595648, 20183379315419545025380352
Offset: 0

Views

Author

Keywords

Crossrefs

Cf. A010046 (cubic), A010047 (4D cubic), A010039 (chi_2, see also A002906), A010042 (mu_2).

Extensions

Name clarified, a(15)-a(17) using Butera & Pernici's formulas added by Andrey Zabolotskiy, Nov 25 2024

A093051 Exponent of 2 in (3^n-3)*2^n.

Original entry on oeis.org

0, 1, 4, 3, 7, 5, 8, 7, 12, 9, 12, 11, 15, 13, 16, 15, 21, 17, 20, 19, 23, 21, 24, 23, 28, 25, 28, 27, 31, 29, 32, 31, 38, 33, 36, 35, 39, 37, 40, 39, 44, 41, 44, 43, 47, 45, 48, 47, 53, 49, 52, 51, 55, 53, 56, 55, 60, 57, 60, 59, 63, 61, 64, 63, 71, 65, 68, 67, 71
Offset: 0

Views

Author

Ralf Stephan, Mar 16 2004

Keywords

Crossrefs

a(n) is the exponent of 2 in A009613(n), A010043(n), A010046(n), A012388(n-1), A009518(n), A012391(n-1), A012457(n-1), A012458(n-1), A012461(n-1), A012462(n-2).

Programs

  • PARI
    a(n)=if(n<1,0,if(n%2==0,a(n/2)+2*floor((n+2)/4)+1,n))

Formula

Recurrence: a(2n) = a(n) + [(n+1)/2] + 1, a(2n+1) = 2n+1.
a(n) = A090740(n) + n - 1, for n >= 1. - Amiram Eldar, Sep 14 2024
Showing 1-5 of 5 results.