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A123028
A003215
inside a second linear differential equation recursion: b(n)=2*b(n-1)-b(n-2)+6-->1+3*n+3*n^2 a(n)=b(n)*a[n-2]/(n*(n-1)).
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1, 1, 19, 37, 1159, 3367, 147193, 569023, 31940881, 154205233, 10572431611, 61219477501, 4958470425559, 33487054193047, 3128794838527729, 24144166073186887, 2556225383077154593, 22188488621258749153
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Maintained by
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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