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Search: id:A049284
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| 0, 0, 0, 1, 1, 2, 4, 7, 13, 24, 43, 78, 140, 251, 452, 812, 1457, 2617, 4697, 8428, 15126, 27142, 48700, 87384, 156787, 281307, 504723, 905562, 1624731, 2915039, 5230040, 9383505, 16835453, 30205347, 54192931, 97230224, 174445475
(list; graph; listen)
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OFFSET
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1,6
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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(4, n), n=1..50) ];
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CROSSREFS
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Cf. A002572, A002573, A002574, A049285.
Sequence in context: A069765 A090427 A006745 this_sequence A049285 A002843 A128742
Adjacent sequences: A049281 A049282 A049283 this_sequence A049285 A049286 A049287
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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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