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 1-3 of 3 results.

A047677 Row 2 of square array defined in A047675: 2*n!*(n+1)!.

Original entry on oeis.org

2, 4, 24, 288, 5760, 172800, 7257600, 406425600, 29262643200, 2633637888000, 289700167680000, 38240422133760000, 5965505852866560000, 1085722065221713920000, 228001633696559923200000, 54720392087174381568000000, 14883946647711431786496000000
Offset: 0

Views

Author

N. J. A. Sloane

Keywords

Comments

a(n) = A152877(2n+1, 2n-2) for n > 0. - Alois P. Heinz, Nov 10 2013

Crossrefs

Cf. A047675, A010790, A152877.

Programs

  • Maple
    a:= proc(n) a(n):= `if`(n=0, 2, n*(n+1) * a(n-1)) end:
seq(a(n), n=0..20);  # Alois P. Heinz, Nov 11 2013
  • Mathematica
    2*Times@@@Partition[Range[0,20]!,2,1] (* Harvey P. Dale, Sep 25 2017 *)

A047676 Main diagonal of square array defined in A047675.

Original entry on oeis.org

1, 4, 2304, 584325558976905216, 35313389841821364727572472840336561596134691007780285818034354666813122266941990584103364198400
Offset: 0

Views

Author

N. J. A. Sloane

Keywords

A047678 Row 3 of square array defined in A047675.

Original entry on oeis.org

3, 24, 2304, 15925248, 26418075402240, 26294650153960734720000, 32976469951036202010909081600000000, 97269850356607540052618180220048900096000000000000, 1156838823908660229380221584221016428369393918222008320000000000000000
Offset: 1

Views

Author

N. J. A. Sloane

Keywords

Showing 1-3 of 3 results.

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

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