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A005717
Construct triangle in which n-th row is obtained by expanding (1+x+x^2)^n and take the next-to-central column.
(Formerly M1612)
+0
19
1, 2, 6, 16, 45, 126, 357, 1016, 2907, 8350, 24068, 69576, 201643, 585690, 1704510, 4969152, 14508939, 42422022, 124191258, 363985680, 1067892399, 3136046298, 9217554129, 27114249960, 79818194925, 235128465026, 693085098852
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 6 19:58 EST 2009. Contains 170429 sequences.
AT&T Labs Research
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