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Search: id:A130494
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| 1, 4, 11, 37, 163, 907, 6067, 47107, 415027, 4084147, 44363827
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OFFSET
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1,2
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FORMULA
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Row sums of triangle A130478. a(1) = 1; a(n), n>1 = n! + A130495(n-1). a(n) = n! + ((n-1)! + (n-2)!) + ((n-2)! + (n-3)!) + ... + (1! + 1). a(n) = n! + sum of first (n-1) terms of A001048 in reverse, where A001048 = (2, 3, 8, 30, 144,...).
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EXAMPLE
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a(5) = 163 sum of row 5 terms of triangle A130478: (120 + 30 + 8 + 3 + 2); where (30, 8, 3, 2) = the first 4 reversed terms of A001048.
a(5) = 163 = 5! + A130495(4) = 120 + 43.
a(5) = 163 = 5! + (4! + 3!) + (3! + 2!) + (2! + 1!) + (1! + 1).
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CROSSREFS
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Cf. A130495, A001048, A130478.
Sequence in context: A149245 A054105 A017939 this_sequence A027573 A149246 A149247
Adjacent sequences: A130491 A130492 A130493 this_sequence A130495 A130496 A130497
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), May 31 2007
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