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 A199123 Number of partitions of n into distinct terms of (2,3)-Ulam sequence, cf. A001857. 6
 1, 0, 1, 1, 0, 2, 0, 2, 2, 2, 3, 2, 3, 3, 4, 4, 5, 5, 6, 6, 6, 8, 8, 9, 11, 10, 12, 14, 12, 17, 16, 17, 22, 19, 24, 25, 25, 30, 30, 33, 37, 37, 42, 45, 46, 52, 54, 57, 64, 66, 69, 79, 76, 87, 93, 91, 109, 105, 115, 126, 123, 140, 144, 151, 166, 169, 180, 193 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 LINKS Eric Weisstein's World of Mathematics, Ulam Sequence Wikipedia, Ulam number EXAMPLE The first terms of A001857 are 2, 3, 5, 7, 8, 9, 13, 14, 18, 19, 24, ... a(20) = #{18+2, 13+7, 13+5+2, 9+8+3, 8+7+5, 8+7+3+2} = 6; a(21) = #{19+2, 18+3, 14+7, 14+5+2, 13+8, 13+5+3, 9+7+5, 9+7+3+2} = 8. PROG (Haskell) a199123 = p a001857_list where    p _  0 = 1    p (u:us) m | m < u = 0               | otherwise = p us (m - u) + p us m CROSSREFS Cf. A000586; A199122, A199017, A199119, A199121. Sequence in context: A036461 A244478 A261153 * A325589 A291308 A207944 Adjacent sequences:  A199120 A199121 A199122 * A199124 A199125 A199126 KEYWORD nonn AUTHOR Reinhard Zumkeller, Nov 03 2011 STATUS approved

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Last modified May 25 06:00 EDT 2020. Contains 334581 sequences. (Running on oeis4.)