The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A327372 Triangle read by rows where T(n,k) is the number of unlabeled simple graphs covering n vertices with exactly k endpoints (vertices of degree 1). 5
 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 3, 1, 1, 1, 1, 11, 5, 4, 1, 2, 0, 62, 29, 18, 6, 4, 2, 1, 510, 225, 101, 32, 13, 4, 3, 0, 7459, 2674, 842, 223, 72, 19, 9, 3, 1, 197867, 50834, 10784, 2171, 504, 115, 34, 9, 4, 0, 9808968, 1653859, 228863, 32322, 5268, 944, 209, 46, 16, 4, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,11 LINKS FORMULA Column-wise first differences of A327371. EXAMPLE Triangle begins:    1    0  0    0  0  1    1  0  1  0    3  1  1  1  1   11  5  4  1  2  0 CROSSREFS Row sums are A002494. Column k = 0 is A261919. The non-covering version is A327371. The labeled version is A327377. Cf. A000088, A004110, A294217, A327227, A327369, A327370. Sequence in context: A141901 A200473 A180172 * A328323 A090751 A322127 Adjacent sequences:  A327369 A327370 A327371 * A327373 A327374 A327375 KEYWORD nonn,tabl AUTHOR Gus Wiseman, Sep 04 2019 EXTENSIONS Terms a(21) and beyond from Andrew Howroyd, Sep 11 2019 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 28 14:53 EDT 2020. Contains 333089 sequences. (Running on oeis4.)