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 A070781 a(n) = binomial((n+1)^2, n^2). 1
 1, 4, 126, 11440, 2042975, 600805296, 262596783764, 159518999862720, 128447994798305325, 132341572939212267400, 169758547725351091518726, 265242021590899282966358400, 495874093230232452749553398586, 1092844289151775603486607296657120 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS All primes between n^2 and (n+1)^2 divide a(n). No prime between (n+1)^2/2 and n^2 divides a(n). Every prime greater than n+1 has exponent 0 or 1 in the prime factorization of a(n). - T. D. Noe, Aug 09 2008 LINKS T. D. Noe, Table of n, a(n) for n=0..50 MATHEMATICA Binomial[#[[2]], #[[1]]]&/@Partition[Range[0, 20]^2, 2, 1] (* Harvey P. Dale, Jul 29 2015 *) CROSSREFS Sequence in context: A253099 A178842 A054053 * A152421 A270959 A291851 Adjacent sequences:  A070778 A070779 A070780 * A070782 A070783 A070784 KEYWORD nonn AUTHOR Karol A. Penson, May 06 2002 EXTENSIONS Better definition from Amarnath Murthy, Jul 14 2005 One more term (a(13)) added by Harvey P. Dale, Jul 29 2015 STATUS approved

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Last modified June 23 17:11 EDT 2021. Contains 345402 sequences. (Running on oeis4.)