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A090411
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G.f.: (1-x)/(1-16x).
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0
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1, 15, 240, 3840, 61440, 983040, 15728640, 251658240, 4026531840, 64424509440, 1030792151040, 16492674416640, 263882790666240, 4222124650659840, 67553994410557440, 1080863910568919040, 17293822569102704640, 276701161105643274240, 4427218577690292387840
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Index entries for sequences related to linear recurrences with constant coefficients, signature (16).
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FORMULA
| a(n) = 15*16^(n-1)+0^n/16.
a(n)=sum{j=0..3, sum{k=0..n, C(4n+j, 4k) }}; a(n)=(A070775(n)+A090407(n)+A001025(n)+A090408(n))/4.
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MATHEMATICA
| Join[{1, a = 15}, Table[a=16*a, {n, 0, 30}]] (* From Vladimir Joseph Stephan Orlovsky, June 10 2011 *)
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PROG
| (PARI) a(n)=if(n, 15<<(4*n-4), 1) \\ Charles R Greathouse IV, Jun 10 2011
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CROSSREFS
| Cf. A090409.
Sequence in context: A157456 A097262 A158557 * A154806 A133199 A059760
Adjacent sequences: A090408 A090409 A090410 * A090412 A090413 A090414
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Nov 30 2003
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