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A099023 Diagonal of Euler-Seidel matrix with start sequence e.g.f. 1-tanh(x). 1
1, -1, 4, -46, 1024, -36976, 1965664, -144361456, 13997185024, -1731678144256, 266182076161024, -49763143319190016, 11118629668610842624, -2925890822304510631936, 895658946905031792553984 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

COMMENTS

T(2n,n), where T is A008280 (signed).

FORMULA

|a(n)| = A000657(n) - Sean A. Irvine, Dec 22 2010

CROSSREFS

Sequence in context: A113264 A126739 A191870 * A000657 A001623 A002077

Adjacent sequences:  A099020 A099021 A099022 * A099024 A099025 A099026

KEYWORD

sign

AUTHOR

Ralf Stephan, Sep 23 2004

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.