A059021 - OEIS

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A059021

Number of 3 X n checkerboards in which the set of red squares is edge-connected.

0, 6, 40, 218, 1126, 5726, 28992, 146642, 741556, 3749816, 18961450, 95880894, 484833212, 2451616864, 12396892316, 62686360476, 316981037374, 1602852315476, 8105013367472, 40983964057352, 207240288658392 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n) = 9a(n - 1) - 26a(n - 2) + 35a(n - 3) - 22a(n - 4) - 3a(n - 5) + 16a(n - 6) - 9a(n - 7) + a(n - 8) - David Radcliffe (dradcliffe(AT)gmail.com), Jan 19 2001`
	CROSSREFS	`See A059020 for the 2 X n case.` `Sequence in context: A001919 A005553 A055344 * A026077 A065113 A052518` `Adjacent sequences: A059018 A059019 A059020 * A059022 A059023 A059024`
	KEYWORD	`nonn`
	AUTHOR	`John W. Layman (layman(AT)math.vt.edu), Dec 14 2000`

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Last modified February 15 03:33 EST 2012. Contains 205694 sequences.