A173451 a(n) = A048883(n-1) - A160121(n).

0, 0, 0, 0, 0, 0, 0, 6, -6, 0, 0, 6, -6, 6, 0, 30, -24, 0, 0, 6, -6, 6, 0, 30, -24, 6, 0, 30, -24, 24, 12, 126, -78, -12, 0, 6, -6, 6, 0, 30, -24, 6, 0, 30, -24, 24, 12, 126, -78, -6, 0, 30, -24, 24, 6, 114, -90, 6, 12, 126, -54, 102, 72, 450, -228, -60, 0, 6, -6, 6, 0

Offset: 1

Author

Omar E. Pol, May 29 2010

Keywords

• sign
• tabf

Comments

It appears that the absolute value of a(n) is a multiple of 6, see A008588. - Omar E. Pol, Dec 06 2013

Examples

			From _Omar E. Pol_, Dec 06 2013: (Start)
Written as an irregular triangle in which row lengths is A011782 the sequence begins:
.    0;
.    0;
.    0,  0;
.    0,  0,0,6;
.   -6,  0,0,6,-6,6,0,30;
.  -24,  0,0,6,-6,6,0,30,-24,6,0,30,-24,24,12,126;
.  -78,-12,0,6,-6,6,0,30,-24,6,0,30,-24,24,12,126,-78,-6,0,30,-24,24,6,114,-90,6,12,126,-54,102,72,450;
. -228,-60,0,6,-6,6,0...
(End)
		

Links

• David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]
• N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
• Index entries for sequences related to toothpick sequences

Crossrefs

Cf. A011782, A048883, A139250, A139251, A160120, A160121, A151710, A173066, A173067, A173068, A173452, A173453.

Extensions

More terms from Nathaniel Johnston, Nov 15 2010