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Search: id:A049285
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| 0, 0, 0, 0, 1, 1, 2, 4, 7, 13, 24, 43, 78, 141, 253, 455, 818, 1468, 2637, 4734, 8495, 15247, 27361, 49094, 88093, 158063, 283599, 508840, 912956, 1638003, 2938861, 5272795, 9460227, 16973125, 30452380, 54636174, 98025512, 175872397
(list; graph; listen)
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OFFSET
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1,7
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REFERENCES
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Even, Shimon; Lempel, Abraham; Generation and enumeration of all solutions of the characteristic sum condition. Information and Control 21 (1972), 476-482.
Minc, H.; A problem in partitions: Enumeration of elements of a given degree in the free commutative entropic cyclic groupoid. Proc. Edinburgh Math. Soc. (2) 11 1958/1959 223-224.
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MAPLE
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v := proc(c, d) option remember; local i; if d < 0 or c < 0 then 0 elif d = c then 1 else add(v(i, d-c), i=1..2*c); fi; end; [ seq(v(5, n), n=1..50) ];
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CROSSREFS
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Cf. A002572, A002573, A049284, A002574.
Sequence in context: A090427 A006745 A049284 this_sequence A002843 A128742 A107281
Adjacent sequences: A049282 A049283 A049284 this_sequence A049286 A049287 A049288
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Michael Somos
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