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A276643
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Number of distinct 4-digit vehicle plates whose sum is n.
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0
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1, 4, 10, 20, 35, 56, 84, 120, 165, 220, 282, 348, 415, 480, 540, 592, 633, 660, 670, 660, 633, 592, 540, 480, 415, 348, 282, 220, 165, 120, 84, 56, 35, 20, 10, 4, 1
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OFFSET
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0,2
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COMMENTS
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a(n) is the number of weak compositions (ordered partitions) into four parts 0, 1, 2, ..., 9. - Joerg Arndt, May 02 2017
a(n) is the number of integers in the range 0 to 9999 whose sum of digits = n. There are 10000 numbers in the range 0 to 9999 and in this sequence they are distributed according to the sum of their digits (n). - Miquel Cerda, Jun 14 2017
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LINKS
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EXAMPLE
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a(0) = 1 because 0000 is the only plate which sums to 0.
a(1) = 4 because there are 4 plates which sum to 1: 0001, 0010, 0100 and 1000.
a(2) = 10 because there are 10 numbers whose digits sum to 2: 2, 11, 20, 101, 110, 200, 1001, 1010, 1100, 2000. - Miquel Cerda, Jun 14 2017
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MATHEMATICA
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Length /@ Split@ Sort@ Map[Total, IntegerDigits@ Range[0, 10^4 - 1]] (* Michael De Vlieger, May 03 2017 *)
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PROG
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(R)
library(dplyr)
data=expand.grid(0:9, 0:9, 0:9, 0:9, KEEP.OUT.ATTRS = FALSE)
data %>%
mutate(n=Var1+Var2+Var3+Var4) %>%
group_by(n) %>%
summarise(value=n()) -> suc
View(suc)
(PARI) { my(x='x+O('x^44)); Vec(sum(k=0, 9, x^k)^4) } \\ Joerg Arndt, May 02 2017
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CROSSREFS
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KEYWORD
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nonn,fini,full,base
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AUTHOR
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STATUS
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approved
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