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A098545 Row sums of A098546. 3
1, 3, 7, 21, 51, 148, 365, 983, 2461, 6360, 15687, 39757, 97033, 240425, 582622, 1421273, 3409861, 8222920, 19565707, 46680362, 110309476, 260876036, 612293443, 1437616751, 3354111156, 7823501148, 18157700800, 42112132458 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

By using multisets (cf. A001700) and multinomials (cf. A005651); A035206 and A036038 were used to generate A049009 (Words over signatures). A098346 and A049019 provide another approach to the same end (compare A090657).

LINKS

Table of n, a(n) for n=1..28.

FORMULA

a(n) = Sum_{k=1..n} binomial(n, k)*A008284(n, k). - Vladeta Jovovic, Jul 24 2005

EXAMPLE

A098546 begins

1

1 2

1 3 3

1 4 6 6 4

so sequence begins 1 3 7 21 ...

CROSSREFS

Cf. A000041, A000312.

Sequence in context: A181393 A036569 A018303 * A161707 A192068 A318395

Adjacent sequences:  A098542 A098543 A098544 * A098546 A098547 A098548

KEYWORD

easy,nonn

AUTHOR

Alford Arnold, Sep 14 2004

EXTENSIONS

More terms from Vladeta Jovovic, Jul 24 2005

STATUS

approved

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Last modified April 14 15:18 EDT 2021. Contains 342949 sequences. (Running on oeis4.)