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A000472
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a(n) = a(n-1)^2 + (a(n-2)+1)(a(n-1)-a(n-2)^2 ).
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1
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OFFSET
| 1,1
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REFERENCES
| Damiani, E.; D'Antona, O.; Naldi, G.; and Pavarino, L.; Tiling bricks with bricks. Stud. Appl. Math. 83 (1990), number 2, 91-110.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..14
Index entries for sequences related to bricks
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MAPLE
| A000472 := proc(n) option remember; if n<=2 then 3*n-1 else A000472(n-1)^2+(1+A000472(n-2))*(A000472(n-1)-A000472(n-2)^2); fi; end;
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MATHEMATICA
| RecurrenceTable[{a[1]==2, a[2]==5, a[n]==a[n-1]^2+(a[n-2]+1)(a[n-1]- a[n-2]^2)}, a[n], {n, 10}] (* From Harvey P. Dale, Sep 29 2011 *)
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PROG
| (MAGMA) I:=[2, 5]; [n le 2 select I[n] else Self(n-1)^2 + (Self(n-2)+1)*(Self(n-1)-Self(n-2)^2 ): n in [1..10]]; // Vincenzo Librandi, Sep 30 2011
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CROSSREFS
| Sequence in context: A068069 A105787 A110497 * A049050 A178322 A165161
Adjacent sequences: A000469 A000470 A000471 * A000473 A000474 A000475
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KEYWORD
| nonn,nice,easy
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AUTHOR
| Ottavio D'Antona [ dantona(AT)hermes.dsi.unimi.it ]
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