cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A180052 Partial sums of A180039.

Original entry on oeis.org

1, 113, 111336, 1111333670, 111113333667115, 111111333336667111671, 1111111333333666671111667338, 111111113333333666667111116667334116, 111111111333333336666667111111666673334112005, 1111111111333333333666666671111111666667333341112001005
Offset: 1

Views

Author

Mark Dols, Aug 08 2010

Keywords

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).

Examples

			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,..

Crossrefs

Cf. A007318, A052262, A180039.

Programs

  • Mathematica
    Accumulate[Accumulate[Table[FromDigits[PadRight[{},n,1]],{n,Accumulate[ Range[10]]}]]] (* Harvey P. Dale, Jun 12 2021 *)
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