A056540 - OEIS

This site is supported by donations to The OEIS Foundation.

A056540

a(1) = 1; to form a(n+1), append a(n)-1, a(n)+1 at the beginning and the end of a(n), respectively. Ignore any leading 0's.

1, 12, 111213, 111212111213111214, 111212111213111213111212111213111214111212111213111215 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	EXAMPLE	`To form the third term from the second term 12, append 11, 13 to the beginning and end of 12, respectively, to get 111213.`
	CROSSREFS	`Sequence in context: A076691 A051368 A103482 * A069048 A100246 A055323` `Adjacent sequences: A056537 A056538 A056539 * A056541 A056542 A056543`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Feb 09 2002`

Content is available under The OEIS End-User License Agreement .

Last modified February 15 15:20 EST 2012. Contains 205823 sequences.