A066237 First differences give A052849.

1, 3, 7, 19, 67, 307, 1747, 11827, 92467, 818227, 8075827, 87909427, 1045912627, 13499954227, 187856536627, 2803205272627, 44648785048627, 756023641240627, 13560771052696627, 256850971870360627, 5122654988223640627

Offset

1,2

Comments

Partial sums of A098558. - Sébastien Desbordes, Dec 18 2023

Links

Table of n, a(n) for n=1..21.

Sébastien Desbordes, Showing why it is the partial sums of A098558

Formula

From Vladeta Jovovic, Dec 20 2001: (Start)

a(n) = n*a(n-1) - (n-1)*a(n-2), a(0)=-1, a(1)=1.

a(n) = 2*A003422(n) - 1. (End)

Mathematica

RecurrenceTable[{a[0]==-1, a[1]==1, a[n]==n*a[n-1]-(n-1)a[n-2]}, a, {n, 30}] (* Harvey P. Dale, Dec 10 2013 *)

Crossrefs

Cf. A003422, A052849, A098558, A052582.

Sequence in context: A051139 A049423 A121825 * A362137 A341323 A135741

Adjacent sequences: A066234 A066235 A066236 * A066238 A066239 A066240

Keyword

nonn,easy

Author

Markus Sullivan (markus(AT)o-reading.co.uk), Dec 19 2001

Extensions

More terms from Jason Earls, Jan 13 2002

Status

approved