The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A056451 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A056451

Number of palindromes using a maximum of five different symbols.
(history; published version)

#42 by Michael De Vlieger at Wed Jun 07 08:31:39 EDT 2023

STATUS

reviewed

approved

#41 by Michel Marcus at Wed Jun 07 01:31:22 EDT 2023

STATUS

proposed

reviewed

#40 by Stefano Spezia at Tue Jun 06 16:10:07 EDT 2023

STATUS

editing

proposed

#39 by Stefano Spezia at Tue Jun 06 15:51:13 EDT 2023

CROSSREFS

Cf. A000007, A016116., A056391, A056453, A056454, A056455, A056456, A057427,

#38 by Stefano Spezia at Tue Jun 06 15:49:03 EDT 2023

DATA

1, 5, 5, 25, 25, 125, 125, 625, 625, 3125, 3125, 15625, 15625, 78125, 78125, 390625, 390625, 1953125, 1953125, 9765625, 9765625, 48828125, 48828125, 244140625, 244140625, 1220703125, 1220703125, 6103515625, 6103515625, 30517578125, 30517578125, 152587890625, 152587890625

#37 by Stefano Spezia at Tue Jun 06 15:47:16 EDT 2023

FORMULA

E.g.f.: cosh(sqrt(5)*x) + sqrt(5)*sinh(sqrt(5)*x). - Stefano Spezia, Jun 06 2023

STATUS

approved

editing

#36 by Charles R Greathouse IV at Thu Sep 08 08:45:01 EDT 2022

PROG

(MAGMAMagma) [5^Floor((n+1)/2): n in [0..40]]; // Vincenzo Librandi, Aug 16 2011

Discussion

Thu Sep 08

08:45

OEIS Server: https://oeis.org/edit/global/2944

#35 by Peter Luschny at Mon Sep 30 18:11:19 EDT 2019

STATUS

reviewed

approved

#34 by Michel Marcus at Mon Sep 30 14:51:42 EDT 2019

STATUS

proposed

reviewed

#33 by Andrew Howroyd at Mon Sep 30 14:28:16 EDT 2019

STATUS

editing

proposed