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 18 results. Next

A226001 Number of pairs of orthogonal (-3,7) vectors of length 10*n.

Original entry on oeis.org

8160, 11670170880, 13816736416550400, 8837797610915077242880, 7704457212444839067088322560, 7041012236359757418211467425218560, 6005570486226633002683450297283300556800
Offset: 1

Views

Author

R. H. Hardin, May 22 2013

Keywords

Comments

Row 15 of A225987.

Examples

			Some solutions for n=1
.-3..7...-3..7...-3..7....7..7....7..7...-3..7....7..7...-3..7...-3.-3....7..7
.-3..7....7.-3....7.-3...-3..7...-3..7....7..7...-3..7...-3..7...-3..7...-3..7
..7.-3....7..7....7.-3....7..7....7.-3....7.-3...-3..7....7..7...-3.-3....7..7
..7.-3...-3..7...-3..7...-3..7...-3..7...-3..7...-3..7....7..7...-3.-3....7.-3
..7.-3....7.-3...-3..7....7..7....7..7...-3..7....7.-3....7.-3...-3.-3....7.-3
.-3..7...-3..7....7.-3...-3..7...-3..7....7..7....7..7....7.-3...-3..7....7..7
..7..7....7..7....7..7...-3..7....7.-3....7.-3....7.-3...-3..7...-3.-3....7.-3
..7..7...-3..7....7..7....7.-3....7..7....7..7...-3..7....7.-3...-3.-3...-3..7
..7..7...-3..7....7..7...-3..7...-3..7...-3..7....7.-3...-3..7...-3.-3....7.-3
..7.-3....7..7...-3..7....7.-3...-3..7....7.-3....7..7....7..7...-3..7....7.-3

Links

Crossrefs

Cf. A225987.

A225986 Number of pairs of orthogonal (-x,y) vectors of length 1*(x+y), where x/y is the n-th rational <= 1, ordered first by y and then x, e.g. 1/1, 1/2, 1/3, 2/3, 1/4, 3/4 ...

Original entry on oeis.org

4, 9, 20, 60, 45, 420, 102, 378, 1120, 3024, 231, 22176, 520, 2376, 8160, 23760, 63360, 164736, 1161, 21780, 185328, 1235520, 2570, 14190, 188760, 544544, 3660800, 9335040, 5643, 147576, 11202048, 70946304, 12300, 80028, 374192, 1408680
Offset: 1

Views

Author

R. H. Hardin May 22 2013

Keywords

Comments

Column 1 of A225987

Examples

			All solutions for n=1
.-1..1...-1.-1...-1..1....1..1
.-1.-1...-1..1....1..1...-1..1

Links

A225988 Number of pairs of orthogonal (-1,2) vectors of length 3*n.

Original entry on oeis.org

9, 390, 20160, 1106424, 62606544, 3611217792, 211096262400, 12461757863808, 741242882016000, 44355068641175040, 2667095701669969920, 161021441731743129600, 9754428938330096713728, 592621128107578217201664
Offset: 1

Views

Author

R. H. Hardin, May 22 2013

Keywords

Comments

Row 2 of A225987.

Examples

			All solutions for n=1
.-1.-1...-1..2...-1..2...-1..2....2..2...-1..2...-1.-1....2..2...-1..2
.-1..2...-1.-1....2.-1....2..2...-1..2....2..2...-1.-1...-1..2...-1..2
.-1.-1...-1.-1....2..2....2.-1....2.-1...-1..2...-1..2...-1..2....2..2

Links

A225989 Number of pairs of orthogonal (-1,3) vectors of length 4*n.

Original entry on oeis.org

20, 3192, 652784, 134432480, 28244153600, 6052498776192, 1314942362273280, 288501497813552640, 63776322167821168640, 14182989297327325110272, 3169467786802943379238912, 711136363409644515952173056
Offset: 1

Views

Author

R. H. Hardin, May 22 2013

Keywords

Comments

Row 3 of A225987.

Examples

			Some solutions for n=1
.-1..3...-1..3....3..3...-1..3...-1..3...-1..3...-1..3...-1.-1....3..3...-1..3
..3..3...-1..3...-1..3....3..3...-1..3....3.-1...-1..3...-1.-1...-1..3....3.-1
.-1..3....3..3...-1..3....3.-1....3.-1....3..3...-1..3...-1.-1....3.-1....3..3
..3.-1....3.-1....3.-1...-1..3....3..3...-1..3....3..3...-1..3....3.-1....3.-1

Links

A225990 Number of pairs of orthogonal (-2,3) vectors of length 5*n.

Original entry on oeis.org

60, 48720, 41801760, 36951200000, 33792065269760, 31520952625612800, 29804588641610956800, 28466071692659367936000, 27397648707462915867279360, 26530254119576872937974661120, 25817362047962660055225414451200
Offset: 1

Views

Author

R. H. Hardin, May 22 2013

Keywords

Comments

Row 4 of A225987.

Examples

			Some solutions for n=1
.-2..3...-2..3...-2..3....3..3...-2.-2...-2..3...-2.-2...-2.-2...-2..3...-2..3
.-2..3....3.-2....3..3...-2..3...-2..3...-2..3...-2..3...-2..3....3.-2....3.-2
..3..3....3..3...-2..3...-2..3...-2.-2...-2..3...-2.-2...-2.-2....3..3...-2..3
.-2..3....3..3....3..3....3..3...-2..3....3..3...-2.-2....3.-2....3..3....3..3
..3..3....3.-2...-2..3....3.-2...-2.-2....3..3....3.-2...-2.-2...-2..3....3..3

Links

A225991 Number of pairs of orthogonal (-1,4) vectors of length 5*n.

Original entry on oeis.org

45, 26010, 21594300, 15593341800, 11432293516320, 8690522384325600, 6699690552347865600, 5206881575348541978240, 4077143683681515029088000, 3212142498665023117259125760, 2542945288539007875744064972800
Offset: 1

Views

Author

R. H. Hardin, May 22 2013

Keywords

Comments

Row 5 of A225987.

Examples

			Some solutions for n=1
.-1..4...-1..4....4..4...-1..4...-1..4...-1.-1...-1..4....4..4...-1..4...-1..4
..4..4...-1..4...-1..4....4.-1....4..4...-1.-1....4.-1...-1..4....4.-1....4..4
..4.-1...-1..4...-1..4....4.-1...-1..4...-1.-1....4..4...-1..4....4..4...-1..4
..4.-1....4..4...-1..4...-1..4...-1..4...-1..4...-1..4....4.-1....4.-1...-1..4
.-1..4...-1..4...-1..4....4..4...-1..4...-1.-1....4.-1....4.-1...-1..4....4.-1

Links

A225992 Number of pairs of orthogonal (-3,4) vectors of length 7*n.

Original entry on oeis.org

420, 8168160, 106322711040, 1496349265582080, 22046445329510891520, 329200486775643608186880, 4991630444756812041482665984, 76438688358604087005593563299840, 1179634366672136518672486151133069312
Offset: 1

Views

Author

R. H. Hardin, May 22 2013

Keywords

Comments

Row 6 of A225987.

Examples

			Some solutions for n=1
.-3..4...-3..4...-3..4...-3..4....4..4...-3..4....4..4...-3.-3...-3.-3....4..4
.-3..4....4..4...-3.-3....4..4...-3..4....4.-3...-3..4...-3.-3...-3.-3....4..4
.-3..4....4.-3...-3.-3....4..4....4..4....4..4....4..4...-3..4...-3..4...-3..4
..4..4....4..4...-3..4...-3..4...-3..4....4.-3...-3..4...-3..4...-3..4....4.-3
..4.-3....4.-3...-3.-3....4.-3....4.-3...-3..4....4..4....4.-3...-3.-3...-3..4
..4..4...-3..4...-3.-3....4..4....4..4....4..4....4.-3...-3.-3...-3.-3....4..4
..4..4....4..4...-3..4...-3..4....4.-3....4..4...-3..4...-3.-3...-3..4....4.-3

Links

A225993 Number of pairs of orthogonal (-1,5) vectors of length 6*n.

Original entry on oeis.org

102, 211332, 720120000, 1722187940880, 4204143930847392, 11097567635368456704, 29480432084171748705792, 78401556201196275000295680, 210537848971493804380009055232, 569368618586592872585662539389952
Offset: 1

Views

Author

R. H. Hardin, May 22 2013

Keywords

Comments

Row 7 of A225987.

Examples

			Some solutions for n=1
.-1..5...-1..5...-1..5...-1..5...-1..5...-1..5...-1..5...-1..5...-1..5...-1..5
.-1..5...-1..5...-1.-1...-1..5....5.-1...-1..5...-1..5....5..5....5.-1....5.-1
.-1..5...-1..5...-1.-1....5.-1....5.-1...-1..5....5..5...-1..5...-1..5....5..5
..5..5...-1..5...-1.-1....5..5...-1..5....5.-1...-1..5...-1..5...-1..5...-1..5
.-1..5....5..5...-1.-1...-1..5...-1..5....5.-1...-1..5....5.-1....5..5....5.-1
.-1..5....5.-1...-1.-1...-1..5....5..5....5..5....5.-1...-1..5....5.-1....5.-1

Links

A225994 Number of pairs of orthogonal (-2,5) vectors of length 7*n.

Original entry on oeis.org

378, 5133128, 81705087744, 983771662124160, 13027612739061516288, 180842352214339004973056, 2505372582582745606695616512, 35065654463193295271305370959872, 495605164965018396615832445084368896
Offset: 1

Views

Author

R. H. Hardin, May 22 2013

Keywords

Comments

Row 8 of A225987.

Examples

			Some solutions for n=1
.-2..5...-2..5...-2..5...-2..5....5..5...-2..5....5..5....5..5...-2..5...-2..5
.-2..5....5..5....5.-2...-2..5....5..5....5..5...-2..5...-2..5....5..5....5.-2
..5..5...-2..5....5.-2....5.-2...-2..5....5.-2....5.-2....5.-2....5.-2....5..5
.-2..5...-2..5....5.-2....5.-2...-2..5....5..5...-2..5....5..5....5.-2....5..5
..5.-2....5.-2....5.-2....5..5....5.-2....5.-2...-2..5...-2..5....5.-2...-2..5
..5..5....5..5....5..5....5.-2...-2..5....5.-2....5.-2....5.-2....5.-2...-2..5
..5.-2....5.-2....5..5....5..5...-2..5...-2..5....5..5....5.-2....5..5...-2..5

Links

A225995 Number of pairs of orthogonal (-3,5) vectors of length 8*n.

Original entry on oeis.org

1120, 96608512, 5476370673664, 284705020569600000, 16898172507712428441600, 995986456574626692094492672, 59516704487206110046425062572032, 3603385124651416948013919241525788672
Offset: 1

Views

Author

R. H. Hardin, May 22 2013

Keywords

Comments

Row 9 of A225987.

Examples

			Some solutions for n=1
.-3..5...-3..5...-3..5....5..5...-3..5...-3..5...-3.-3...-3..5...-3..5....5..5
..5..5....5.-3....5..5...-3..5...-3..5....5..5...-3.-3....5..5....5.-3...-3..5
..5.-3....5.-3....5.-3....5..5....5..5....5..5...-3..5...-3..5....5.-3....5.-3
..5..5...-3.-3....5..5...-3..5....5.-3....5.-3....5.-3...-3..5....5..5....5..5
.-3..5...-3.-3....5..5....5..5....5..5....5.-3...-3.-3....5..5...-3..5....5.-3
..5.-3...-3.-3....5.-3...-3..5....5.-3....5..5...-3.-3....5..5....5..5....5..5
..5.-3...-3.-3...-3..5...-3..5...-3..5....5.-3....5.-3...-3..5...-3..5....5.-3
..5..5...-3.-3...-3..5....5.-3....5..5...-3..5...-3.-3....5.-3....5..5....5.-3

Links

Showing 1-10 of 18 results. Next

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