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A180052
Partial sums of
A180039
.
0
1, 113, 111336, 1111333670, 111113333667115, 111111333336667111671, 1111111333333666671111667338, 111111113333333666667111116667334116, 111111111333333336666667111111666673334112005, 1111111111333333333666666671111111666667333341112001005
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OFFSET
1,2
COMMENTS
Row 5 of the Pascal array expressed as triangular numbers in 2 ways (value and number of digits). Could be viewed as part of a group expressing the n-th row of the Pascal array in n ways (see example).
LINKS
Table of n, a(n) for n=1..10.
EXAMPLE
For the fifth row of the Pascal array, n=5:
1,5,15,..
1,14,150,..
1,113,111336,..
1,1112,1111112223,..
1,11111,111111111111111,..
For n=4:
1,4,10,20,..
1,13,136,1370,..
1,112,111223,1111222334,..
1,1111,1111111111,11111111111111111111,..
MATHEMATICA
Accumulate[Accumulate[Table[FromDigits[PadRight[{}, n, 1]], {n, Accumulate[ Range[10]]}]]] (*
Harvey P. Dale
, Jun 12 2021 *)
CROSSREFS
Cf.
A007318
,
A052262
,
A180039
.
Sequence in context:
A352400
A329105
A304324
*
A106748
A220983
A122503
Adjacent sequences:
A180049
A180050
A180051
*
A180053
A180054
A180055
KEYWORD
nonn
AUTHOR
Mark Dols
, Aug 08 2010
STATUS
approved
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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)