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A144495
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Row 2 of array in A144502.
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1
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2, 7, 30, 155, 946, 6687, 53822, 486355, 4877250, 53759351, 646098622, 8409146187, 117836551730, 1768850337295, 28318532194206, 481652022466307, 8673291031865602, 164849403644999655, 3297954931572397790, 69274457019123638011, 1524368720086682440242
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| a(n) = 1/2( A001339(n) + A001339(n+1)..2=1/2(1+3), 7- 1/2(11+3), 30 =1/2(11+49)... [From Gary Detlefs (gdetlefs(AT)aol.com), Jun 06 2010]
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FORMULA
| E.g.f.: exp(x)*(2-x)/(1-x)^3.
a(n) = 1/2 (floor((n+1)*(n+1)!*e) + floor(n*n!*e)) [From Gary Detlefs (gdetlefs(AT)aol.com), Jun 06 2010]
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CROSSREFS
| Sequence in context: A030896 A030848 A030975 * A154259 A066114 A088128
Adjacent sequences: A144492 A144493 A144494 * A144496 A144497 A144498
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KEYWORD
| nonn
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AUTHOR
| David Applegate and N. J. A. Sloane (njas(AT)research.att.com), Dec 13 2008
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