A030719 - OEIS

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A030719

Number of new terms at stage n in the formation of A030717.

1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 7, 8, 10, 12, 13, 16, 18, 20, 23, 25, 28, 31, 33, 36, 38, 41, 43, 45, 47, 50, 53, 56, 60, 62, 65, 69, 72, 78, 83, 86, 88, 92, 95, 99, 105, 110, 114, 117, 122, 125, 130, 136, 140, 144, 149, 153, 159, 162, 167, 173, 180, 184, 188

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..1024 (First 500 terms from Reinhard Zumkeller)

MATHEMATICA

nn = 63; c[_] = 0; r = k = a[1] = c[1] = 1; Reap[Do[w = Union@ Array[a, k]; Do[Set[a[j + k], c[w[[j]]]], {j, Length[w]}]; Do[c[a[j + k]]++, {j, Length[w]}]; k += Sow[Length[w]], {nn}]][[-1, -1]] (* Michael De Vlieger, Nov 15 2022 *)

PROG

(Haskell)

a030719 n = a030719_list !! (n-1)

a030719_list = tail $ zipWith (-) (tail a253170_list) a253170_list

-- Reinhard Zumkeller, Dec 28 2014

CROSSREFS

Cf. A030717, A253170.

Sequence in context: A104408 A008718 A248958 * A126027 A111581 A116572

Adjacent sequences: A030716 A030717 A030718 * A030720 A030721 A030722

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved