OEIS sequences thread

[muladharma]

Please only share links to OEIS sequences!
I'll start:

A000292 - OEIS Tetrahedral (or triangular pyramidal) numbers

 

[muladharma]

A000142 - OEIS Factorial numbers

 

[downwardsfromzero]

A000032 - OEIS Lucas numbers

Lots of interesting footnotes to this one.

 

[muladharma]

A002559 - OEIS Markoff (or Markov) numbers

 

[muladharma]

A000032 - OEIS Lucas numbers

Lots of interesting footnotes to this one.

A000045 - OEIS Fibonacci numbers

 

[downwardsfromzero]

A000045 - OEIS Fibonacci numbers

I nearly started with that one but thought it was too obvious

 

[downwardsfromzero]

A000384 - OEIS

hexagonal numbers

 

[muladharma]

A034444 - OEIS a is the number of unitary divisors of n (d such that d divides n, gcd(d, n/d) = 1)

 

[muladharma]

A007894 - OEIS Number of fullerenes with 2n vertices (or carbon atoms). Brinkmann, Gunnar and Dress, Andreas W. M.; A constructive enumeration of fullerenes. J. Algorithms 23 (1997), no. 2, 345-358.

 

[muladharma]

A000079 - OEIS Powers of 2: a = 2^n. (Formerly M1129 N0432)