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A107733 Column 2 of the array in A107735. 0
1, 3, 13, 11, 141, 43, 1485, 171, 15565, 683, 163021, 2731, 1707213, 10923, 17878221, 43691, 187223245, 174763, 1960627405, 699051, 20531956941, 2796203, 215013444813, 11184811, 2251650026701, 44739243, 23579585203405, 178956971, 246928622013645, 715827883, 2585870100909261, 2863311531 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

REFERENCES

S. Mukai, An Introduction to Invariants and Moduli, Cambridge, 2003; see p. 483.

LINKS

Table of n, a(n) for n=3..34.

FORMULA

a(n) = 1 + Sum_{j=1..g} 2^(2j-1) if n = 2g+2, = 1 + 4 Sum_{j=1..g} C(2g+1, 2j) 5^(j-1) if n = 2g+1.

From Chai Wah Wu, Jun 19 2016: (Start)

a(n) = 17*a(n-2) - 80*a(n-4) + 128*a(n-6) - 64*a(n-8) for n > 10.

G.f.: x^3*(-64*x^7 + 96*x^5 - 40*x^3 - 4*x^2 + 3*x + 1)/(64*x^8 - 128*x^6 + 80*x^4 - 17*x^2 + 1). (End)

CROSSREFS

Sequence in context: A273674 A214811 A121565 * A273076 A272825 A054767

Adjacent sequences:  A107730 A107731 A107732 * A107734 A107735 A107736

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 10 2005

EXTENSIONS

More terms from Emeric Deutsch, Jun 22 2005

STATUS

approved

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Last modified February 19 10:54 EST 2019. Contains 320310 sequences. (Running on oeis4.)