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A002426
Central trinomial coefficients: largest coefficient of (1+x+x^2)^n.
(Formerly M2673 N1070)
+0
140
1, 1, 3, 7, 19, 51, 141, 393, 1107, 3139, 8953, 25653, 73789, 212941, 616227, 1787607, 5196627, 15134931, 44152809, 128996853, 377379369, 1105350729, 3241135527, 9513228123, 27948336381, 82176836301, 241813226151
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 25 08:46 EST 2009. Contains 167481 sequences.
AT&T Labs Research
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