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 A028275 Elements in 4-Pascal triangle (by row). 14
 1, 1, 1, 1, 4, 1, 1, 5, 5, 1, 1, 6, 10, 6, 1, 1, 7, 16, 16, 7, 1, 1, 8, 23, 32, 23, 8, 1, 1, 9, 31, 55, 55, 31, 9, 1, 1, 10, 40, 86, 110, 86, 40, 10, 1, 1, 11, 50, 126, 196, 196, 126, 50, 11, 1, 1, 12, 61, 176, 322, 392, 322, 176, 61, 12, 1, 1, 13, 73, 237, 498, 714, 714, 498, 237 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS Table of n, a(n) for n=0..74. FORMULA Apart from first 3 rows, use the Pascal rule. T(n, k) = C(n, k) + 2C(n-2, k-1). G.f.: (1+2x^2y) / [1-x(1+y)]. - Ralf Stephan, Jan 31 2005 EXAMPLE 1; 1 1; 1 4 1; 1 5 5 1; 1 6 10 6 1; ... CROSSREFS Cf. A028262, A028313. Sequence in context: A318795 A099575 A173740 * A173118 A147289 A147566 Adjacent sequences: A028272 A028273 A028274 * A028276 A028277 A028278 KEYWORD easy,nonn AUTHOR Mohammad K. Azarian EXTENSIONS More terms from Ben Baugher (s1191623(AT)cedarville.edu) STATUS approved

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Last modified September 7 13:22 EDT 2024. Contains 375730 sequences. (Running on oeis4.)