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A091782
a(1) = 1, a(2) = 1, a(3) = a(1) + concatenation a(1), a(2). In general a(n) = a(1) + a(1)a(2)+ a(1)a(2)a(3) + ... + a(1)a(2)...a(n-1), where a(1)a(2)...a(r) is the concatenation of first r terms.
1
1, 1, 12, 1124, 11122248, 1112112422244496, 11121124111222482224224844488992, 1112112411122248111211242224449622242248222444964448449688977984
OFFSET
1,3
FORMULA
a(n) = concat(a(1), ..., a(n-1)) + a(n-1). - Charles R Greathouse IV, Mar 30 2004
EXAMPLE
a(3) = 1+11 = 12.
CROSSREFS
Cf. A091781.
Sequence in context: A004073 A109229 A112457 * A291952 A112580 A229691
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Feb 17 2004
EXTENSIONS
More terms from Charles R Greathouse IV, Mar 30 2004
STATUS
approved