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A105524 Diagonal sums of number triangle A105522. 1
1, -2, 2, 0, -1, -2, 4, 4, -10, -12, 30, 36, -93, -114, 300, 372, -994, -1244, 3364, 4240, -11578, -14676, 40400, 51448, -142592, -182288, 508166, 651756, -1826037, -2348562, 6608844, 8520564, -24069258, -31097388, 88145436, 114096096, -324391422, -420590652, 1199074584 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

G.f.: ((1+2x)sqrt(1+4x^2)-4x^2-2x-1)/(sqrt(1+4x^2)-3)

CROSSREFS

Sequence in context: A096994 A035370 A163000 * A166387 A000209 A170982

Adjacent sequences:  A105521 A105522 A105523 * A105525 A105526 A105527

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Apr 13 2005

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Last modified February 14 06:48 EST 2012. Contains 205577 sequences.