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A081345 First row in maze arrangement of natural numbers A081344. 2
1, 4, 5, 16, 17, 36, 37, 64, 65, 100, 101, 144, 145, 196, 197, 256, 257, 324, 325, 400, 401, 484, 485, 576, 577, 676, 677, 784, 785, 900, 901, 1024, 1025, 1156, 1157, 1296, 1297, 1444, 1445, 1600, 1601, 1764, 1765, 1936, 1937, 2116, 2117, 2304, 2305, 2500 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n)= n^2+n+1-n(-1)^n=n^2+n+1+n(-1)^(n+1). a(2n)=A053755(n) a(2n+1)=4*A004120(n)

CROSSREFS

Cf. A081346.

Sequence in context: A078713 A175263 A000695 * A137527 A024854 A025617

Adjacent sequences:  A081342 A081343 A081344 * A081346 A081347 A081348

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 19 2003

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Last modified February 13 19:38 EST 2012. Contains 205536 sequences.