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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
OFFSET
0,5
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
Sequence in context: A318795 A099575 A173740 * A173118 A147289 A147566
KEYWORD
easy,nonn
EXTENSIONS
More terms from Ben Baugher (s1191623(AT)cedarville.edu)
STATUS
approved