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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 Table of n, a(n) for n=0..67. Eric Weisstein's World of Mathematics, Ulam Sequence Wikipedia, Ulam number Index entries for Ulam numbers 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 June 24 16:36 EDT 2024. Contains 373680 sequences. (Running on oeis4.)