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A127137 Define an array by Q(m, 0) = 1, Q(m, 1) = 1; Q(m, 2k) = (m - 2k + 1)*Q(m+1, 2k-1) - (2k-1)*Q(m+2, k-2), m*Q(m, 2k+1) = (m - 2k)*Q(m+1, 2k) - 2k(m+1)*Q(m+2, 2k-1). Sequence gives Q(0,n). 7
1, 1, -2, -5, 12, 43, -120, -531, 1680, 8601, -30240, -172965, 665280, 4161555, -17297280, -116658675, 518918400, 3735104625, -17643225600, -134498225925, 670442572800, 5380583766075, -28158588057600, -236759435017875, 1295295050649600, 11364769115001225, -64764752532480000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

V. van der Noort and N. J. A. Sloane, Paper in preparation, 2007.

LINKS

Table of n, a(n) for n=0..26.

FORMULA

See A127080 for e.g.f.

CROSSREFS

A001813 interleaved with A090470.

See A127080 for the array Q. A column of A127080.

Sequence in context: A009739 A062272 A215789 * A172239 A183758 A071787

Adjacent sequences:  A127134 A127135 A127136 * A127138 A127139 A127140

KEYWORD

sign

AUTHOR

N. J. A. Sloane, Mar 24 2007

STATUS

approved

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Last modified December 10 18:10 EST 2019. Contains 329901 sequences. (Running on oeis4.)