The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A255047 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A255047

1 together with the positive terms of A000225.
(history; published version)

#56 by N. J. A. Sloane at Wed Dec 21 20:12:57 EST 2022

STATUS

proposed

approved

#55 by Chai Wah Wu at Wed Dec 21 18:14:16 EST 2022

STATUS

editing

proposed

#54 by Chai Wah Wu at Wed Dec 21 18:14:11 EST 2022

PROG

(Python)

def A255047(n): return -1^(-1<<n) if n else 1 # Chai Wah Wu, Dec 21 2022

STATUS

approved

editing

#53 by N. J. A. Sloane at Tue Dec 28 00:02:00 EST 2021

STATUS

proposed

approved

#52 by Salah Uddin Mohammad at Fri Nov 19 21:34:37 EST 2021

STATUS

editing

proposed

#51 by Salah Uddin Mohammad at Fri Nov 19 21:33:01 EST 2021

COMMENTS

Also, the number of unlabeled connected P-series (equivalently, connected P-graphs) with n +1 elements. - Salah Uddin Mohammad, Nov 19 2021

Discussion

Fri Nov 19

21:34

Salah Uddin Mohammad: Yes, A255047(n) equals the number of unlabeled connected P-series (equivalently, connected P-graphs) with n+1 elements.

#50 by Salah Uddin Mohammad at Fri Nov 19 21:31:08 EST 2021

COMMENTS

Also, the number of n-element unlabeled connected P-series (equivalently, connected P-graphs) with n elements. - Salah Uddin Mohammad, Nov 19 2021

STATUS

proposed

editing

#49 by Salah Uddin Mohammad at Fri Nov 19 19:29:37 EST 2021

STATUS

editing

proposed

Discussion

Fri Nov 19

20:59

Andrew Howroyd: You mean {n+1}-element ?

#48 by Salah Uddin Mohammad at Fri Nov 19 19:29:16 EST 2021

CROSSREFS

Cf. A000225, A011782, A028310, A246674, A253909, A265007, A265202, A349276.

#47 by Salah Uddin Mohammad at Fri Nov 19 19:27:26 EST 2021

COMMENTS

Also, the number of n-element unlabeled connected P-series (equivalently, connected P-graphs). - Salah Uddin Mohammad, Nov 19 2021

STATUS

approved

editing