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A331474 Hankel transform of A331473. 1
1, 3, 2, -50, -43, 535, 487, -4983, -4654, 43174, 40919, -357743, -342287, 2875755, 2769818, -22615130, -21889027, 174913543, 169936759, -1335320799, -1301209414, 10087636558, 9853833647, -75551725535, -73949216543, 561774270675, 550790510642, -4151593378178 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..27.

FORMULA

G.f.: (1 + 3x + 16x^2 - 8x^3 + 36x^4 - 12x^5 + x^6 - x^7)/(1 + 7x^2 + x^4)^2 (conjecture).

CROSSREFS

Cf. A331473.

Sequence in context: A009395 A339513 A226769 * A093892 A104254 A336519

Adjacent sequences:  A331471 A331472 A331473 * A331475 A331476 A331477

KEYWORD

sign

AUTHOR

Paul Barry, Jan 17 2020

STATUS

approved

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Last modified May 9 00:09 EDT 2021. Contains 343685 sequences. (Running on oeis4.)