

A211365


Array read by antidiagonals: T(m,n) = Sum(1<=i<=m) i * (2m+n1i)!


1



1, 2, 10, 6, 36, 186, 24, 168, 1032, 6936, 120, 960, 6840, 53040, 462120, 720, 6480, 52560, 461520, 4499280, 48453840, 5040, 50400, 458640, 4495680, 48449520, 571404960, 7321381200, 40320, 443520, 4475520, 48424320, 571374720, 7321345920
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

Index numbers (compare A055089) of permutations like (2,4,6,...,1,3,5...).


LINKS

Tilman Piesk, Table of n, a(n) for n = 1..2016
Tilman Piesk, Arrays of permutations (Wikiversity)


EXAMPLE

T(3,2) = Sum( 1 <= i <= 3 ) [ i * (7i)! ]
= 1*(71)! + 2*(72)! + 3*(73)!
= 1*720 + 2*120 + 3*24
= 1032


CROSSREFS

Cf. A055089.
Sequence in context: A076374 A142954 A082225 * A213135 A037187 A166542
Adjacent sequences: A211362 A211363 A211364 * A211366 A211367 A211368


KEYWORD

nonn,tabl


AUTHOR

Tilman Piesk, Jun 22 2012


STATUS

approved



