A134825 - OEIS

A134825

Floor of the even-indexed Bernoulli numbers B_{2n} = A000367(n)/A002445(n).

1, 0, -1, 0, -1, 0, -1, 1, -8, 54, -530, 6192, -86581, 1425517, -27298232, 601580873, -15116315768, 429614643061, -13711655205089, 488332318973593, -19296579341940069, 841693047573682615, -40338071854059455414, 2115074863808199160560, -120866265222965259346028

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OFFSET

0,9

REFERENCES

C. J. Moreno and S. S. Wagstaff, Jr., Sums of Squares of Integers, Chapman & Hall, 2006, p. 107.

LINKS

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

FORMULA

a(n) = floor(B_(2n)), n>=0, with B_{2n} = A000367(n)/A002445(n) = A027641(2n)/A027642(2n).

EXAMPLE

n=4: B_8=-1/30=-0,033... hence a(4)=-1.

MATHEMATICA