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 1-6 of 6 results.

A201379 Number of nX3 0..1 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.

Original entry on oeis.org

2, 4, 19, 27, 115, 122, 467, 433, 1461, 1208, 3797, 2931, 8642, 6292, 17780, 12430, 33822, 22825, 60401, 39688, 102439, 65739, 166387, 104780, 260549, 161323, 395367, 241382, 583802, 351915, 841664, 501871, 1188050, 701410, 1645719, 963241
Offset: 1

Views

Author

R. H. Hardin Nov 30 2011

Keywords

Comments

Column 3 of A201384

Examples

			Some solutions for n=10
..0..0..1....0..0..0....0..0..1....0..0..1....0..0..0....0..0..1....0..0..0
..0..1..0....0..0..0....0..1..0....0..1..0....0..0..1....0..0..1....0..0..1
..0..1..0....0..0..1....0..1..0....0..1..0....0..0..1....0..0..1....0..0..1
..0..1..0....0..1..1....0..1..1....0..1..0....0..1..0....0..0..1....0..0..1
..0..1..1....0..1..1....0..1..1....1..0..0....0..1..0....0..1..1....0..0..1
..1..0..0....0..1..1....1..0..0....1..0..0....0..1..0....1..0..0....0..1..1
..1..0..1....0..1..1....1..0..0....1..0..1....1..0..1....1..0..1....1..0..1
..1..1..0....1..0..0....1..0..1....1..1..0....1..1..0....1..0..1....1..1..0
..1..1..0....1..1..0....1..1..0....1..1..0....1..1..1....1..0..1....1..1..0
..1..1..0....1..1..1....1..1..0....1..1..1....1..1..1....1..1..0....1..1..1
		

Formula

Empirical: a(n) = 4*a(n-2) -3*a(n-4) -8*a(n-6) +14*a(n-8) -14*a(n-12) +8*a(n-14) +3*a(n-16) -4*a(n-18) +a(n-20)

A201380 Number of nX4 0..1 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.

Original entry on oeis.org

1, 7, 27, 121, 483, 1751, 5694, 16870, 46014, 116842, 278837, 630353, 1358517, 2806843, 5584567, 10741640, 20039166, 36362252, 64333159, 111214759, 188207532, 312302096, 508868575, 815256003, 1285706310, 1998034336, 3062559792
Offset: 1

Views

Author

R. H. Hardin Nov 30 2011

Keywords

Comments

Column 4 of A201384

Examples

			Some solutions for n=9
..0..0..0..1....0..0..0..1....0..0..0..1....0..0..0..0....0..0..0..0
..0..0..1..1....0..0..0..1....0..0..1..1....0..0..0..1....0..0..1..1
..0..1..1..0....0..0..1..0....0..0..1..1....0..1..1..0....0..1..0..0
..0..1..1..0....0..1..0..1....0..0..1..1....0..1..1..0....0..1..0..1
..1..0..0..0....0..1..0..1....0..1..0..1....0..1..1..0....0..1..1..0
..1..0..0..1....0..1..0..1....0..1..1..0....0..1..1..1....0..1..1..1
..1..1..0..0....0..1..0..1....1..0..1..0....1..0..1..1....0..1..1..1
..1..1..0..1....1..1..1..0....1..0..1..0....1..1..0..0....1..0..1..1
..1..1..0..1....1..1..1..1....1..0..1..1....1..1..1..0....1..1..0..0
		

Formula

Empirical: a(n) = 4*a(n-1) +a(n-2) -20*a(n-3) +4*a(n-4) +52*a(n-5) +6*a(n-6) -112*a(n-7) -64*a(n-8) +196*a(n-9) +174*a(n-10) -228*a(n-11) -325*a(n-12) +148*a(n-13) +457*a(n-14) -457*a(n-16) -148*a(n-17) +325*a(n-18) +228*a(n-19) -174*a(n-20) -196*a(n-21) +64*a(n-22) +112*a(n-23) -6*a(n-24) -52*a(n-25) -4*a(n-26) +20*a(n-27) -a(n-28) -4*a(n-29) +a(n-30)

A201381 Number of nX5 0..1 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.

Original entry on oeis.org

2, 9, 115, 483, 7148, 24779, 295813, 804538, 7711613, 17135660, 137991357, 261853930, 1838296465, 3078156753, 19352193027, 29273561002, 168059197372, 233637796573, 1242746736360, 1608517392555, 8015798428649, 9756858004272
Offset: 1

Views

Author

R. H. Hardin Nov 30 2011

Keywords

Comments

Column 5 of A201384

Examples

			Some solutions for n=6
..0..0..0..1..1....0..0..0..1..1....0..0..0..0..1....0..0..0..1..1
..0..0..1..0..0....0..0..1..0..1....0..0..1..1..1....0..0..1..0..0
..0..0..1..0..1....0..1..0..1..0....0..1..0..0..1....0..0..1..0..1
..0..1..1..1..1....0..1..1..1..1....1..1..0..0..0....0..1..1..1..1
..1..0..1..0..1....1..0..1..0..0....1..1..0..1..0....1..0..0..0..0
..1..1..0..1..0....1..1..1..0..0....1..1..0..1..1....1..1..1..1..1
		

A201382 Number of nX6 0..1 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.

Original entry on oeis.org

1, 13, 122, 1751, 24779, 326650, 3826202, 39589830, 364013320, 3005372641, 22522846792, 154739772302, 983097718721, 5818909235791, 32292922468841, 168956847012130, 837348841763554, 3947230438308504, 17762594565022972
Offset: 1

Views

Author

R. H. Hardin Nov 30 2011

Keywords

Comments

Column 6 of A201384

Examples

			Some solutions for n=5
..0..0..0..1..1..1....0..0..1..1..1..1....0..0..0..0..0..1....0..0..0..0..0..1
..0..1..1..0..0..1....0..1..0..0..1..1....0..0..0..0..1..0....0..0..1..1..1..1
..0..1..1..0..1..1....0..1..1..1..0..1....0..0..1..1..1..1....0..1..0..0..1..0
..0..1..1..1..0..1....1..0..0..0..0..0....0..1..1..1..1..0....1..1..0..1..1..0
..1..0..0..0..0..0....1..0..0..1..1..0....1..1..1..1..0..1....1..1..1..0..0..1
		

A201383 Number of nX7 0..1 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.

Original entry on oeis.org

2, 16, 467, 5694, 295813, 3826202, 175765510, 1819250859, 65629320845, 534428405524, 15483460261810, 102996778664996, 2488946990439369, 14017118437802211, 291386682009006888, 1427682924988875276
Offset: 1

Views

Author

R. H. Hardin Nov 30 2011

Keywords

Comments

Column 7 of A201384

Examples

			Some solutions for n=4
..0..0..0..0..0..1..1....0..0..0..0..0..0..1....0..0..0..0..1..1..1
..0..0..1..1..1..0..1....0..1..1..1..1..1..0....0..0..1..1..0..1..1
..1..1..0..0..1..1..0....0..1..1..1..1..1..0....0..1..1..1..0..1..1
..1..1..0..1..0..1..0....1..0..0..0..1..1..0....1..0..0..0..0..0..1
		

A201378 Number of n X n 0..1 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.

Original entry on oeis.org

2, 3, 19, 121, 7148, 326650, 175765510, 74872992399, 400292326222730, 1748923742658486631
Offset: 1

Views

Author

R. H. Hardin Nov 30 2011

Keywords

Comments

Diagonal of A201384

Examples

			Some solutions for n=5
..0..0..0..0..1....0..0..0..1..1....0..0..0..1..1....0..0..0..0..0
..0..0..1..1..0....0..0..0..1..1....0..0..1..0..0....0..1..1..1..1
..0..1..1..1..0....0..0..1..0..1....0..1..0..0..0....1..0..0..0..1
..1..0..0..1..1....0..1..1..0..1....0..1..1..0..1....1..0..0..0..1
..1..0..1..1..0....1..0..0..1..1....1..1..1..1..1....1..0..1..1..1
		
Showing 1-6 of 6 results.