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A110329
Diagonal sums of a number triangle related to the Pell numbers.
1
1, 2, 11, 76, 727, 8694, 125221, 2107448, 40577501, 879557050, 21193809151, 561950634852, 16258832340451, 509717865337646, 17211690137010377, 622780718533047664, 24039198822957409081, 985985136339748008498
OFFSET
0,2
COMMENTS
Diagonal sums of A110327.
FORMULA
a(n)=sum{k=0..floor(n/2), (n-k)!*Pell(n-2k+1)/k!}
CROSSREFS
Cf. A000129.
Sequence in context: A349408 A053481 A368794 * A221844 A006766 A120380
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jul 20 2005
STATUS
approved