id:A081347 - OEIS Search Results

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First column in maze arrangement of natural numbers.

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1, 2, 3, 12, 13, 30, 31, 56, 57, 90, 91, 132, 133, 182, 183, 240, 241, 306, 307, 380, 381, 462, 463, 552, 553, 650, 651, 756, 757, 870, 871, 992, 993, 1122, 1123, 1260, 1261, 1406, 1407, 1560, 1561, 1722, 1723, 1892, 1893, 2070, 2071, 2256, 2257, 2450, 2451 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Interleaves two times the hexagonal numbers A000384 with A054554.`
	FORMULA	`a(n) = ((1+2n^2)+(1-2n)(-1)^n)/2 a(2n)=A054554(n). a(2n+1)=2*A000384(n).`
	EXAMPLE	`Starting with 1,2,3, turn (LL) and then repeat (RRR)(LLL) to get` `1 6 7 20` `2 5 8 19` `3 4 9 18` `12 11 10 17`
	CROSSREFS	`Cf. A081348, A080335.` `Sequence in context: A157900 A157902 A102660 this_sequence A074347 A102034 A102150` `Adjacent sequences: A081344 A081345 A081346 this_sequence A081348 A081349 A081350`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 19 2003`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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