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 A259604 (A259542(n) + A259542(n+1)) / 2. 6
 3, 6, 10, 15, 10, 6, 10, 15, 21, 28, 36, 45, 36, 28, 36, 45, 55, 36, 21, 28, 36, 45, 36, 28, 36, 45, 55, 66, 78, 91, 78, 66, 78, 91, 105, 78, 55, 66, 78, 91, 78, 66, 78, 91, 105, 120, 136, 153, 120, 78, 91, 105, 91, 78, 66, 78, 105, 120, 136, 153, 171, 153 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms are triangular numbers by definition of A259542. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 PROG (Haskell) a259604 n = a259604_list !! (n-1) a259604_list = zipWith ((flip div 2 .) . (+))                        a259542_list \$ tail a259542_list CROSSREFS Cf. A259542, A000217, A086517, A259602, A259603, A259605. Sequence in context: A194101 A105333 A126234 * A130484 A074374 A109804 Adjacent sequences:  A259601 A259602 A259603 * A259605 A259606 A259607 KEYWORD nonn AUTHOR Reinhard Zumkeller, Jun 30 2015 STATUS approved

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Last modified August 25 13:50 EDT 2019. Contains 326324 sequences. (Running on oeis4.)