A352684 - OEIS

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A352684

a(n) = A352682(n, n).

1, 1, 3, 11, 42, 176, 808, 4015, 21423, 122035, 738424, 4725200, 31854056, 225472729, 1670849235, 12929089547, 104227219082, 873524820380, 7596906788456, 68442869865191, 637789899261963, 6138617062823371, 60945644655192264, 623410514987315252, 6562725963582441936

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

Table of n, a(n) for n=0..24.

FORMULA

a(n) = (n-1)*Gould(n-1) + Bell(n) for n >= 1.

PROG

(Julia)

function A352684(n)

a = BigInt(n == 0 ? 1 : n)

P = BigInt[1]; T = BigInt[1]

for k in 1:n-1

T = push!(T, a)

P = cumsum(pushfirst!(P, a))

a = P[end]

end

a end

[A352684(n) for n in 0:24] |> println

CROSSREFS

Cf. A040027 (Gould), A000110 (Bell), A352682.

Sequence in context: A200212 A149070 A066655 * A302421 A118166 A277888

Adjacent sequences: A352681 A352682 A352683 * A352685 A352686 A352687

KEYWORD

nonn

AUTHOR

Peter Luschny, Mar 30 2022

STATUS

approved