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 1-2 of 2 results.

A138533 Resort the multinomial sequence A036038 by source partition as described in A126442, A129306 and A136101.

Original entry on oeis.org

1, 2, 1, 6, 3, 1, 24, 12, 4, 1, 6, 120, 60, 20, 5, 1, 30, 10, 720, 360, 120, 30, 6, 1, 180, 60, 15, 20, 90
Offset: 1

Views

Author

Alford Arnold, Mar 27 2008

Keywords

Comments

Multinomials count permutations of multisets and also paths in lattices; for example, there are six paths (from null to full) through the lattice of divisors for signature 36: 2233 2323 2332 3223 3232 and 3322.

Examples

			a(11) is six because the eleventh least prime signature in source format is 36 the signature for partition 2+2 the ninth partition and A036038(9) = 6.
The tables begin:
1.......2.......6.......24......120.....720....5040.....40320......362880
........1.......3.......12.......60.....360....2520.....20160......181440
................1.......4........20.....120.....840......6720.......60480
........................1........5.......30.....210......1680.......15120
.. ..............................1........6......42......336........3024
..........................................1.......7.......56.........504
..................................................1........8..........72
...........................................................1...........9
.......................................................................1
........................6........30.....180....1260....10080........90720
.................................10......60.....420.....3360........30240
...
		

Crossrefs

Cf. A173333. [From Reinhard Zumkeller, Feb 19 2010]

A140691 Suppress the zeros in A126441 and resort the natural numbers as illustrated in sequence A136101.

Original entry on oeis.org

1, 2, 3, 4, 5, 7, 8, 9, 11, 15, 6, 16, 17, 19, 23, 31, 10, 13, 32, 33, 35, 39, 47, 63, 18, 21, 27, 12, 14, 64, 65, 67, 71, 79, 95, 127, 34, 37, 43, 55, 20, 25, 22, 29, 128, 129, 131, 135, 143, 159, 191, 255, 66, 69, 75, 87, 111, 36, 41, 51, 38, 45, 59, 24, 26, 30, 256, 257, 259
Offset: 1

Views

Author

Alford Arnold, May 23 2008

Keywords

Comments

Table A138138 (a shell model) is another sequence illustrating row patterns for numeric partitions.

Examples

			A136101(11) is 36 and is 2*2*3*3 corresponding to the partition 2+2 which maps to 6 in A136101 so A140691(11) is 6.
		

Crossrefs

Showing 1-2 of 2 results.