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 1-10 of 14 results. Next

A306178 Number of unrooted self-avoiding walks with n steps that can make turns from the set 0, +-Pi/4, +-Pi/2, +-3*Pi/4.

Original entry on oeis.org

1, 4, 15, 86, 492, 2992, 18172, 110643, 672267, 4069122, 24578785, 147972210, 889332713, 5331980703, 31924424199
Offset: 1

Views

Author

Hugo Pfoertner, Jun 23 2018

Keywords

Comments

The turning angles are those of the regular octagon, with one vertex corresponding to the forbidden U-turn. The path may neither intersect nor touch itself anywhere.

Links

Crossrefs

Cf. A266925, A037245, A306175, A151541, A306177, A306179, A306180, A306181, A306182.

Extensions

a(7)-a(15) from Bert Dobbelaere, May 15 2025

A306175 Number of unrooted self-avoiding walks with n steps that can make turns from the set +-Pi/5, +-3*Pi/5.

Original entry on oeis.org

1, 2, 6, 19, 66, 229, 831, 2991, 10859, 39173, 141631, 510079, 1835583, 6586932, 23614821, 84492315, 302014619, 1077860479, 3843695976, 13690026688
Offset: 1

Views

Author

Hugo Pfoertner, Jun 23 2018

Keywords

Comments

The turning angles are those of the regular pentagon, with one vertex corresponding to the forbidden U-turn. The path may neither intersect nor touch itself anywhere.

Links

Crossrefs

Cf. A266925, A037245, A151541, A306177, A306178, A306179, A306180, A306181, A306182, A316195.

Extensions

a(7)-a(9) from Hugo Pfoertner, Dec 23 2018
a(10)-a(20) from Bert Dobbelaere, May 15 2025

A306177 Number of unrooted self-avoiding walks with n steps that can make turns from the set +-Pi/7, +-3*Pi/7, +-5*Pi/7.

Original entry on oeis.org

1, 3, 11, 55, 275, 1444, 7609, 40220, 212051, 1114206, 5840287, 30521627, 159166728, 828130291, 4301636648
Offset: 1

Views

Author

Hugo Pfoertner, Jun 23 2018

Keywords

Comments

The turning angles are those of the regular heptagon, with one vertex corresponding to the forbidden U-turn. The path may neither intersect nor touch itself anywhere.

Links

Crossrefs

Cf. A266925, A037245, A306175, A151541, A306178, A306179, A306180, A306181, A306182.

Extensions

a(7)-a(15) from Bert Dobbelaere, May 15 2025

A306179 Number of unrooted self-avoiding walks with n steps that can make turns from the set +-Pi/9, +-3*Pi/9, +-5*Pi/9, +-7*Pi/9.

Original entry on oeis.org

1, 4, 19, 128, 861, 6051, 42475, 297993, 2081607, 14485077, 100475175, 694838429, 4793805002
Offset: 1

Views

Author

Hugo Pfoertner, Jun 23 2018

Keywords

Comments

The turning angles are those of the regular nonagon, with one vertex corresponding to the forbidden U-turn. The path may neither intersect nor touch itself anywhere.

Links

Crossrefs

Cf. A266925, A037245, A306175, A151541, A306177, A306178, A306180, A306181, A306182.

Extensions

a(7)-a(13) from Bert Dobbelaere, May 15 2025

A306180 Number of unrooted self-avoiding walks with n steps that can make turns from the set 0, +-Pi/5, +-2*Pi/5, +-3*Pi/5, +-4*Pi/5.

Original entry on oeis.org

1, 5, 23, 169, 1233, 9551
Offset: 1

Views

Author

Hugo Pfoertner, Jun 23 2018

Keywords

Comments

The turning angles are those of the regular decagon, with one vertex corresponding to the forbidden U-turn. The path may neither intersect nor touch itself anywhere.

Links

Crossrefs

Cf. A266925, A037245, A306175, A151541, A306177, A306178, A306179, A306181, A306182.

A306181 Number of unrooted self-avoiding walks with n steps that can make turns from the set +-Pi/11, +-3*Pi/11, +-5*Pi/11, +-7*Pi/11, +-9*Pi/11.

Original entry on oeis.org

1, 5, 28, 235, 1970, 17201, 149420, 1295637, 11178026, 96047288, 822418731, 7020762655
Offset: 1

Views

Author

Hugo Pfoertner, Jun 23 2018

Keywords

Comments

The turning angles are those of the regular 11-gon, with one vertex corresponding to the forbidden U-turn. The path may neither intersect nor touch itself anywhere.

Links

Crossrefs

Cf. A266925, A037245, A306175, A151541, A306177, A306178, A306179, A306180, A306182.

Extensions

a(7)-a(12) from Bert Dobbelaere, May 15 2025

A306182 Number of unrooted self-avoiding walks with n steps that can make turns from the set 0, +-Pi/6, +-2*Pi/6, +-3*Pi/6, +-4*Pi/6, +-5*Pi/6.

Original entry on oeis.org

1, 6, 33, 306, 2765, 26290, 247737, 2332965, 21856232, 204019196, 1897940592, 17606864337
Offset: 1

Views

Author

Hugo Pfoertner, Jun 23 2018

Keywords

Comments

The turning angles are those of the regular 12-gon, with one vertex corresponding to the forbidden U-turn. The path may neither intersect nor touch itself anywhere.

Links

Crossrefs

Cf. A266925, A037245, A306175, A151541, A306177, A306178, A306179, A306180, A306181.

Extensions

a(7)-a(12) from Bert Dobbelaere, May 15 2025

A159867 Number of 2-sided n-triangular polyedges.

Original entry on oeis.org

1, 3, 12, 60, 375, 2613, 19074, 143660, 1101860, 8562292, 67206242, 531804577, 4236708679
Offset: 1

Views

Author

Eric W. Weisstein, Apr 24 2009

Keywords

Links

Crossrefs

Cf. A151539, A151540, A151541.

Extensions

a(9) and a(10) from Joseph Myers, Oct 05 2011
a(11)-a(13) from Aaron N. Siegel, May 22 2022

A151540 Number of 1-sided triangular strip polyedges with n cells.

Original entry on oeis.org

1, 3, 14, 54, 239, 1007, 4375, 18728, 80572, 344651, 1473402, 6280556, 26732173, 113570050, 481832209, 2041461824, 8639576140, 36524803606, 154269617690, 651036955831, 2745359144355
Offset: 1

Views

Author

Ed Pegg Jr, May 13 2009

Keywords

Links

Crossrefs

Cf. A151539, A151541, A159867.

Extensions

a(9)-a(13) from Joseph Myers, Oct 05 2011
a(14)-a(21) from Bert Dobbelaere, Mar 23 2025

A306176 Number of symmetric unrooted self-avoiding walks of n steps on hexagonal lattice.

Original entry on oeis.org

1, 3, 4, 12, 18, 50, 78, 208, 337, 867, 1440, 3613, 6133, 15058, 26037, 62756, 110274, 261524, 466183, 1089717, 1967725, 4540103, 8294946, 18913123, 34929064, 78778601, 146943175, 328097471, 617667052, 1366311508, 2594446392, 5689203511, 10890701272, 23687039917, 45689624111, 98612105026
Offset: 1

Views

Author

Hugo Pfoertner, Jun 25 2018

Keywords

Links

Crossrefs

Cf. A001334, A151541.

Extensions

a(10)-a(36) from Bert Dobbelaere, Mar 23 2025
Showing 1-10 of 14 results. Next

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.