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A156894
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a(n)=sum{k=0..n, C(n,k)*C(2n+k-1,k)}.
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0
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1, 3, 19, 138, 1059, 8378, 67582, 552576, 4563235, 37972290, 317894394, 2674398268, 22590697614, 191475925332, 1627653567916, 13870754053388, 118464647799075, 1013709715774130, 8689197042438274, 74594573994750972
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