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 A081540 Sum of terms in row n of A081539. 4
 0, 3, 48, 615, 7404, 86415, 987648, 11111103, 123456780, 12469134879, 1259259166920, 127160484583143, 12839505247415568, 1296296203651668195, 130864188256177941024, 13209875614718906234055, 1333333240382001836547288, 134567891929211304968880723, 13580245982022242628303234360 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MAPLE conca := proc(S) local resul, d, i ; resul := 0 ; for i from 1 to nops(S) do d := ilog10(op(i, S))+1 ; resul := resul*10^d+op(i, S) ; od ; resul ; end: A081539 := proc(row) local a, p, i; if row =1 then RETURN([0]) ; fi ; a := [] ; p := [seq(i, i=1..row)] ; for i from 1 to row do a := [op(a), conca(subsop(i=NULL, p))] ; od: sort(a)[1..row] ; end: A081540 := proc(n) local r ; r := A081539(n) ; add(r[i], i=1..n) ; end: seq(A081540(n), n=1..20) ; # R. J. Mathar, Jul 15 2007 CROSSREFS Cf. A081539. Sequence in context: A335178 A260347 A140650 * A294829 A264730 A024042 Adjacent sequences:  A081537 A081538 A081539 * A081541 A081542 A081543 KEYWORD nonn,base AUTHOR Amarnath Murthy, Mar 29 2003 EXTENSIONS Corrected and extended by R. J. Mathar, Jul 15 2007 STATUS approved

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Last modified September 28 09:32 EDT 2021. Contains 347714 sequences. (Running on oeis4.)