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.

A153726 Initial digit of Catalan number A000108(n).

Original entry on oeis.org

1, 1, 2, 5, 1, 4, 1, 4, 1, 4, 1, 5, 2, 7, 2, 9, 3, 1, 4, 1, 6, 2, 9, 3, 1, 4, 1, 6, 2, 1, 3, 1, 5, 2, 8, 3, 1, 4, 1, 6, 2, 1, 3, 1, 5, 2, 8, 3, 1, 5, 1, 7, 2, 1, 4, 1, 6, 2, 1, 4, 1, 6, 2, 9, 3, 1, 5, 2, 8, 3, 1, 5, 2, 7, 3, 1, 4, 1, 7, 2, 1, 4, 1, 6, 2, 1
Offset: 0

Views

Author

Omar E. Pol, Dec 30 2008

Keywords

Links

Crossrefs

Cf. A000030, A008963, A077648, A152669.

Programs

  • Mathematica
    First[IntegerDigits[#]]&/@CatalanNumber[Range[0,120]] (* Harvey P. Dale, Jan 20 2014 *)

Formula

a(n)=A000030(A000108(n)).

Extensions

More terms from Harvey P. Dale, Jan 20 2014

A152753 Last digit of even Catalan number A152670(n).

Original entry on oeis.org

2, 4, 2, 2, 0, 2, 6, 6, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 2, 2, 4, 0, 8, 4, 8, 0, 4, 2, 2, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 6, 2, 0, 4, 2, 2, 4, 0, 2, 6, 6, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
Offset: 1

Views

Author

Omar E. Pol, Dec 12 2008

Keywords

Comments

Even values of A152669.

Crossrefs

Cf. A000108, A038003, A094389, A152669, A152670.
Showing 1-2 of 2 results.

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

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