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 A306094 Number of plane partitions of n where parts are colored in (at most) 4 colors. 6
 1, 4, 36, 228, 1540, 8964, 56292, 316388, 1857028, 10301892, 57884132, 312915172, 1720407492, 9132560068, 48898964964, 256790538660, 1350883911620, 6992031608260, 36296271612324, 185785685287076, 952221494828996, 4831039856692356, 24489621255994276 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS a(0) = 1 corresponds to the empty sum, in which all terms are colored in one among four given colors, since there is no term at all. LINKS Alois P. Heinz, Table of n, a(n) for n = 0..50 FORMULA a(n) = Sum_{k=1..n} A091298(n,k)*4^k. EXAMPLE For n = 1, there is only the partition , which can be colored in any of the four colors, whence a(1) = 4. For n = 2, there are the partitions , [1,1] and [1;1]. Adding colors, this yields a(2) = 4 + 16 + 16 = 36 distinct possibilities. PROG (PARI) a(n)=!n+sum(k=1, n, A091298(n, k)*4^k) CROSSREFS Cf. A091298, A208447. Column 4 of A306100 and A306101. See A306099 and A306093 for columns 2 and 3. Sequence in context: A074434 A257888 A197424 * A018217 A003488 A295411 Adjacent sequences:  A306091 A306092 A306093 * A306095 A306096 A306097 KEYWORD nonn AUTHOR M. F. Hasler, Sep 22 2018 EXTENSIONS a(12) corrected and a(13)-a(22) added by Alois P. Heinz, Sep 24 2018 STATUS approved

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Last modified May 26 02:56 EDT 2020. Contains 334613 sequences. (Running on oeis4.)