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A007876 a(2n-1) = n*a(2n-2), a(2n) = n*a(2n-1) + 1. 0
1, 2, 4, 9, 27, 82, 328, 1313, 6565, 32826, 196956, 1181737, 8272159, 57905114, 463240912, 3705927297, 33353345673, 300180111058, 3001801110580, 30018011105801, 330198122163811, 3632179343801922, 43586152125623064 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..23.

CROSSREFS

Sequence in context: A110138 A148085 A003320 * A176068 A296264 A219665

Adjacent sequences:  A007873 A007874 A007875 * A007877 A007878 A007879

KEYWORD

nonn,easy

AUTHOR

buzzard(AT)math.berkeley.edu (Kevin Buzzard)

STATUS

approved

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Last modified November 15 18:10 EST 2018. Contains 317240 sequences. (Running on oeis4.)