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A105423
Number of compositions of n+2 having exactly two parts equal to 1.
+0
2
1, 0, 3, 3, 9, 15, 31, 57, 108, 199, 366, 666, 1205, 2166, 3873, 6891, 12207, 21537, 37859, 66327, 115842, 201743, 350412, 607140, 1049545, 1810428, 3116655, 5355219, 9185349, 15728547, 26890375, 45904773, 78253896, 133221079
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.
AT&T Labs Research
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