A182779 a(n) = A049019(n) * A118851(n). Irregular table read by rows.

1, 1, 2, 2, 3, 12, 6, 4, 24, 24, 72, 24, 5, 40, 120, 180, 360, 480, 120, 6, 60, 240, 180, 360, 2160, 720, 1440, 4320, 3600, 720, 7, 84, 420, 840, 630, 5040, 3780, 7560, 3360, 30240, 20160, 12600, 50400, 30240, 5040

Offset: 0

Author

Alford Arnold, Dec 01 2010

Keywords

• nonn
• tabf

Comments

The sequences have shape A000041 and their respective row sums are A000670, A006906 and A006153.

Examples

			For n = 3 the values are (3,12,6) = (1,6,6)*(3,2,1).
Table starts:
1;
1;
2, 2;
3, 12, 6;
4, (24, 24), 72, 24;
5, (40, 120), (180, 360), 480, 120;
6, (60, 240, 180), (360, 2160, 720), (1440, 4320), 3600, 720;
7, (84, 420, 840), (630, 5040, 3780, 7560), (3360, 30240, 20160), (12600, 50400), 30240, 5040;
		

Crossrefs

Cf. A006153 (related to function composition), A133314 (signed version of A049019).

Formula

a(n) = A049019(n) * A118851(n).

Extensions

a(0) = 1 prepended by Peter Luschny, May 31 2020