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 A230953 Boustrophedon transform of odd primes, cf. A065091. 7
 3, 8, 20, 53, 154, 505, 1944, 8651, 44046, 252271, 1605874, 11245261, 85907084, 710970323, 6336648426, 60510526207, 616355168958, 6670526004559, 76438597647616, 924584128977111, 11772170758462928, 157382330019694067, 2204239468545788024, 32275035859881159165 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..400 Peter Luschny, An old operation on sequences: the Seidel transform J. Millar, N. J. A. Sloane and N. E. Young, A new operation on sequences: the Boustrophedon transform, J. Combin. Theory, 17A 44-54 1996 (Abstract, pdf, ps). Wikipedia, Boustrophedon_transform FORMULA a(n) = sum(A109449(n,k)*A000040(k+2): k=0..n). E.g.f.: (sec(x) + tan(x)) * Sum_{k>=0} prime(k+2)*x^k/k!. - Ilya Gutkovskiy, Jun 26 2018 MATHEMATICA t[n_, 0] := Prime[n+2]; t[n_, k_] := t[n, k] = t[n, k-1] + t[n-1, n-k]; a[n_] := t[n, n]; Array[a, 30, 0] (* Jean-François Alcover, Feb 12 2016 *) PROG (Haskell) a230953 n = sum \$ zipWith (*) (a109449_row n) \$ tail a000040_list CROSSREFS Cf. A000747, A230956, A230954, A230955. Sequence in context: A295346 A027220 A305823 * A026995 A018035 A271843 Adjacent sequences:  A230950 A230951 A230952 * A230954 A230955 A230956 KEYWORD nonn AUTHOR Reinhard Zumkeller, Nov 03 2013 STATUS approved

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Last modified January 23 00:56 EST 2019. Contains 319365 sequences. (Running on oeis4.)