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A022468 Number of 3's in n-th term of A007651. 2
0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 11, 15, 22, 26, 32, 44, 56, 74, 100, 126, 163, 220, 284, 376, 486, 627, 817, 1077, 1392, 1829, 2354, 3108, 4020, 5271, 6861, 8949, 11625, 15209, 19790, 25821, 33671, 43875, 57165, 74629, 97186, 126692, 165238 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Peter J. C. Moses, Table of n, a(n) for n = 1..1000

MATHEMATICA

p={10, -15, 11, -18, 12, 14, -25, 12, -28, 43, -13, 2, 0, -21, 10, 10, 3, 8, -10, -11, 5, 9, -18, 16, -31, 35, -20, 15, -6, -10, 36, -44, 9, -1, 3, 16, -11, 23, -3, -25, -17, -27, 43, 24, 24, -33, -24, -7, 14, 6, 9, -5, 10, 0, -9, -9, -12, 7, 14, 7, -1, -9, -6, 2, 3, 2, 1, -1, 0, -1, -1, 0, 0, 1, 0, 0, 0, 0, 0}; q={6, -9, 9, -18, 16, -11, 14, -8, 1, -5, 7, 2, 8, -14, -5, -5, 19, 3, -6, -7, -6, 16, -7, 8, -22, 17, -12, 7, 5, 7, -8, 4, -7, -9, 13, -4, -6, 14, -14, 19, -7, -13, 2, -4, 18, 0, -1, -4, -12, 8, -5, 0, 8, 1, 7, -8, -5, -2, 3, 3, 0, 0, 0, 0, -2, -1, 0, 3, 1, -1, -1, -1, 1}; gf=Fold[x #1+#2&, 0, p]/Fold[x #1+#2&, 0, q]; CoefficientList[Series[gf, {x, 0, 99}], x] (* Peter J. C. Moses, Jun 24 2013 *)

CROSSREFS

Sequence in context: A295073 A322340 A282504 * A257664 A181324 A050933

Adjacent sequences: A022465 A022466 A022467 * A022469 A022470 A022471

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified December 5 11:50 EST 2022. Contains 358586 sequences. (Running on oeis4.)