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A107875
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Column 1 of triangle A107873; a(n) = C( n*(n+1)/2 + n+3, n).
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2
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1, 5, 28, 220, 2380, 33649, 593775, 12620256, 314457495, 8996462475, 290752384208, 10477677064400, 416579843773639, 18114175790089400, 855130180330364620, 43553532185070076800, 2380434572658017204175
(list; graph; refs; listen; history; internal format)
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