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 A028283 Central elements in 4-Pascal triangle A028275 (by row). 1
 1, 4, 10, 32, 110, 392, 1428, 5280, 19734, 74360, 281996, 1074944, 4115020, 15808912, 60917800, 235350720, 911315430, 3535767000, 13742347740, 53495534400, 208537056420, 813950932080, 3180614712600, 12441628655040 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Equals A000984, [1, 2, 6, 20, 70, ...] convolved with [1, 2, 0, 0, 0, ...]. - Gary W. Adamson, Jun 05 2009 LINKS FORMULA a(n) = 2*A051960(n-1). a(n) = 2*A000108(n)*(3n-1). - Ralf Stephan, Aug 24 2003 CROSSREFS Cf. A000108, A028275, A051960. Sequence in context: A303832 A316103 A137954 * A196991 A151746 A110145 Adjacent sequences:  A028280 A028281 A028282 * A028284 A028285 A028286 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified July 28 17:15 EDT 2021. Contains 346335 sequences. (Running on oeis4.)