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A067303 Even indexed members of A067302. 2
1, 18, 1752, 282304, 54547200, 11478167040, 2533556365312, 576271774875648, 133776598692003840, 31513560479297044480, 7505638177922587557888, 1802924878727702252617728, 436026430783762289982963712 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

FORMULA

a(n) = A067302(2n) = (n+1)*A067297(2*n).

G.f.: (x*(d/dx)A(x) + A(x)) with A(x) g.f. of A067320.

CROSSREFS

Cf. A067322 (odd indexed members of A067302).

Sequence in context: A086193 A064347 A253121 * A055740 A072477 A249332

Adjacent sequences:  A067300 A067301 A067302 * A067304 A067305 A067306

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Feb 05 2002

STATUS

approved

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Last modified October 16 13:11 EDT 2019. Contains 328070 sequences. (Running on oeis4.)