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1, 6, 18, 48, 120, 288, 672, 1536, 3456, 7680, 16896, 36864, 79872, 172032, 368640, 786432, 1671168, 3538944, 7471104, 15728640, 33030144, 69206016, 144703488, 301989888, 629145600, 1308622848, 2717908992, 5637144576
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (4,-4).
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FORMULA
| Row sums of A128542, binomial transform of A007310 (assuming offset 0).
Row sums of triangle A134239 - Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 14 2007
a(n) = 3*n*2^(n-2) for n>1. - R. J. Mathar, Oct 25 2011
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EXAMPLE
| A128543 can be generated by taking addition rows of A007310:
1....6....18....48...
..5....12...30...
.....7....18...
........11...;
..where A007310 = (1, 5, 7, 11, 13,...); numbers congruent to 1 or 5 mod 6.
Or, by the binomial transform operation, a(4) = 48 = 1*1 + 3*5 + 3*7 + 1*11 = (1 + 15 + 21 + 11).
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CROSSREFS
| Cf. A128542, A007310, A134239.
Sequence in context: A182706 A095170 A188379 * A003202 A003198 A099857
Adjacent sequences: A128540 A128541 A128542 * A128544 A128545 A128546
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KEYWORD
| nonn,easy
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Mar 10 2007
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