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.

Showing 1-2 of 2 results.

A275540 a(n) = n! + n!! - n - 1.

Original entry on oeis.org

1, 0, 1, 5, 27, 129, 761, 5137, 40695, 363815, 3632629, 39927183, 479047667, 6227155921, 87178936305, 1307676395009, 20922800209903, 355687462555407, 6402373891522541, 121645101063561055, 2432902011892531179
Offset: 0

Views

Author

Olivier Gérard, Aug 01 2016

Keywords

Crossrefs

Cf. A006882, A110903, A128882.

Programs

  • Mathematica
    Table[n! + n!! - n - 1, {n, 0, 20}] (* Bruno Berselli, Aug 11 2016 *)

A275541 (n)! + (n + 1)!!/(n + 1) - 2.

Original entry on oeis.org

0, 0, 1, 6, 25, 126, 733, 5086, 40423, 363262, 3629743, 39920638, 479011993, 6227066878, 87178426333, 1307675013118, 20922791915023, 355687438417918, 6402373740187423, 121645100594626558, 2432902008831369073
Offset: 0

Views

Author

Olivier Gérard, Aug 01 2016

Keywords

Crossrefs

Cf. A006882, A128882.
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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