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A101163 Diagonal sums of a Chebyshev number triangle. 2
1, 2, 3, 5, 10, 24, 64, 182, 542, 1685, 5473, 18594, 66063, 245078, 947057, 3802469, 15826392, 68158314, 303273906, 1392503108, 6590530876, 32117814629, 160998508095, 829301391150, 4385370872477, 23786062734932, 132224164567459 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Diagonal sums of number triangle A101161.

LINKS

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

FORMULA

a(n)=sum{k=0..floor(n/2), if(k=n-k, 1, 2T(n-2k, (k+2)/2)) where T(n, k)=(n/2)sum{j=0..floor(n/2), C(n-j, j)(-1)^j*(2k)^(n-2j)}.

CROSSREFS

Cf. A101162.

Sequence in context: A063253 A099967 A106531 * A155587 A125658 A001200

Adjacent sequences:  A101160 A101161 A101162 * A101164 A101165 A101166

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Dec 03 2004

STATUS

approved

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Last modified February 20 09:05 EST 2019. Contains 320325 sequences. (Running on oeis4.)