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 A115409 Inverse integer permutation of A115408. 4
 1, 5, 4, 7, 6, 2, 17, 16, 12, 10, 20, 19, 15, 13, 3, 43, 42, 38, 36, 26, 23, 51, 50, 46, 44, 34, 31, 8, 105, 104, 100, 98, 88, 85, 62, 54, 114, 113, 109, 107, 97, 94, 71, 63, 9 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Seen as a triangle read by rows T(n,k) = a(n*(n-1)/2+k) = A024431(n)-A024431(k-1), 1<=k<=n. T(n,1) = A024431(n)-1; T(n,n) = A247414(n-1). - Reinhard Zumkeller, Sep 16 2014 LINKS Reinhard Zumkeller, >Rows n = 1..125 of triangle, flattened PROG (Haskell) import Data.List (inits) a115409 n k = a115409_tabl !! (n-1) !! (k-1) a115409_row n = a115409_tabl !! (n-1) a115409_tabl = map f \$ drop 2 \$ inits a024431_list where    f xs = reverse \$ map (z -) zs where (z:zs) = reverse xs a115409_list = concat a115409_tabl -- Reinhard Zumkeller, Sep 16 2014 CROSSREFS Cf. A024431, A247414. Sequence in context: A195428 A254373 A004446 * A010775 A010485 A194362 Adjacent sequences:  A115406 A115407 A115408 * A115410 A115411 A115412 KEYWORD nonn,tabl,look AUTHOR Reinhard Zumkeller, Jan 22 2006 STATUS approved

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Last modified October 13 21:59 EDT 2019. Contains 327981 sequences. (Running on oeis4.)