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A067303
Even-indexed members of A067302.
2
1, 18, 1752, 282304, 54547200, 11478167040, 2533556365312, 576271774875648, 133776598692003840, 31513560479297044480, 7505638177922587557888, 1802924878727702252617728, 436026430783762289982963712
OFFSET
0,2
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
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Feb 05 2002
STATUS
approved